UX-13 P5: Dutch text, STYLE check, DOCS screenshots, period editor

- app/ui_text/nl.json and app/uitext.py: every page word in Dutch, English
  fallback per key; the page picks by browser language. Home's sentences
  move into ui_text `home_words`, so /status?lang=nl builds them in Dutch.
- test_ui_text.py: EN/NL key and placeholder parity, STYLE limits, jargon
  lists for both languages, no inline details, untranslated Dutch caught.
  Shared rules moved unchanged to tools/style_rules.py.
- tools/ux13_screenshots.sh/.py: DOCS screenshots from the demo fixtures in
  headless Chromium; docs/img/ux13/. Battery modes (P3): no screenshot.
- "Other time windows": a list editor (ui.periods) that builds
  static_profile and names bad times, empty prices, overlaps and gaps.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

STYLE.md

@@ -7,7 +7,7 @@ This applies to everything a home owner or installer reads: notifications, phone
 - **Body**: **one sentence** of at most 25 words, saying what happened and what to do. A **red alarm** may use up to **3 sentences** (70 words, each sentence at most 30 words), so that no action a person must take is lost.
 - **Details**: the last line links to the add-on documentation and names the section with the rest: `Details: add-on documentation, section "<title>" under Notifications.` Background, figures, reason codes and history go there or into the log, never into the body.
 - **Status row**: one sentence of at most 15 words. A **red** row may use up to 3 sentences (30 words), like a red alarm. It shows the live numbers the reader acts on and never an HA entity id. **Banner**: at most 12 words. **Refusal**: at most 30 words, naming the setting by its label and then its key, as `messages.setting()` writes it: “Inverter rating” (max_w), or “Inverter rating” for inverter-b (inverters.max_w) for one inverter in the list. **Option name**: at most 6 words, not counting the group prefix. **Option description**: at most 30 words. Where a value comes from belongs in DOCS.md.
-- **Plan line** (UX-13 Home screen: the plan, tooltips, a battery's "now" line): at most 2 sentences, each at most 12 words. Words from `app/homeview.py`, checked by `test_messages.py` part 8.
+- **Plan line** (UX-13 Home screen: the plan, tooltips, a battery's "now" line): at most 2 sentences, each at most 12 words. Words in `app/ui_text/<lang>.json` under `home_words`, built by `app/homeview.py`, checked by `test_messages.py` part 8. The page's own words, English and Dutch, are checked by `test_ui_text.py`.
 - **Log line** (WARNING/ERROR): one line of at most 25 words **as logged**, with any built text filled in. Log lines stay in English and are not translated. A line that reports a safety reason gives one plain sentence and the reason's code (`STALE_READING`, `OUTPUT_CLAMP`), the evidence an installer searches for. The reason itself, with its figures and limits, goes on a DEBUG line right after it and into the action log, never onto the WARNING/ERROR line. It keeps the shape of a red alarm: at most 3 sentences of at most 30 words. The line as logged has no semicolon, banned word, capitals, "1 times" or "(s)". `test_messages.py` part 6 builds every such text with the real code and checks it, and lists the few non-safety families still over 25 words. A line that repeats every cycle is DEBUG. INFO lines carry no section numbers, ISO timestamps or capitals.
 - **Refusal length is counted as shown**: a setting placeholder counts as its label and key, and the long cases are driven through the validator (`test_messages.py` part 3).
 - **Event line** under the buttons: the plain words of `messages.hint()`, like a green row. The add-on's own action log stays technical and is not shown on the page. Installers read it as `events` in the `status` JSON.

docs/img/ux13/README.md

@@ -0,0 +1,9 @@
+# UX-13 screenshots
+
+Made from the real page by `goodwe_controller/tools/ux13_screenshots.sh`. Do not
+edit them by hand: run the script again.
+
+- `home-*.png`: Home, running, in Dutch, in shadow mode, at phone width, and in setup.
+- `settings-*.png`: Settings (Installer view), and the time-window editor with an overlap.
+- `setup-step-1*.png`: Setup, step 1.
+- Battery modes (the Batteries screen and the Simple view): not built yet (UX-13 P3), so no screenshot.

goodwe_controller/DECISIONS/UX-13-one-layout-table.md

@@ -70,6 +70,23 @@ What UX-02 made authoritative stays authoritative:
   Its tables (`KETTLE`, `SHADOW`) are in `uilayout.py`, and its live checks
   are rules, so they are in `validate.py` (`setup_checks`). settings.js still
   names no key. See [[UX-13-setup-wizard]].
+- P5: the page words are in `app/ui_text/en.json` and `nl.json`, one key set,
+  loaded by `app/uitext.py` with an English fallback per key. The page picks
+  Dutch when the browser's language is `nl`, as the classic page does. Home's
+  sentences moved from `homeview.py` into `home_words`, so `/status?lang=nl`
+  builds them in Dutch. Status rows, banners, hints and validator sentences
+  (`messages.py`, `validate.py`) stay English: they are shared with
+  notifications, the log and the start refusal. `test_ui_text.py` checks both
+  files against STYLE.md and each other, using the rules in
+  `tools/style_rules.py`, which it shares with test_messages.py.
+- P5: "Other time windows" is a list editor (`ui.periods`, control
+  `period_list`). `uimodel._periods_json()` builds `static_profile` and names
+  the first bad time, empty price, overlap or gap. Its tiling rule matches
+  `static_tariff._check_tiling`. A stored profile whose days the editor has no
+  choice for (for example "mon,wed") is still kept as stored and edited in the
+  Configuration tab. Supervisor 2026.08.0's `AppOptions` accepted all 133
+  wizard blobs, 17 of them with time windows
+  (`tools/ux13_wizard_blobs.py --supervisor`, run offline on 2026-09-28).
 
 ## 4. What this costs
 

goodwe_controller/DOCS.md

@@ -2886,6 +2886,12 @@ works under hourly pricing is an EMS for a minority. `static_profile` is how a
 two-period day/night tariff or a single fixed price becomes a first-class
 configuration rather than "turn the price feature off and hope".
 
+On the add-on page, choose **Other time windows** under Settings, Tariff and
+prices, or in Setup step 4. Add one row per time window, with its start, end,
+days and price. The page names any overlap, gap or empty price before you can
+save. You only need the JSON below for days the page cannot choose, such as
+Monday and Wednesday only.
+
 It is one option, holding a JSON object, on one line:
 
 ```json
@@ -3221,6 +3227,18 @@ action log (`Controller.events`). The page no longer shows that log, but the
 page and add `status` to its address. The action-log tables in this document
 refer to it.*
 
+### Language and screenshots
+
+The page is in Dutch when your browser's language is Dutch, and in English
+otherwise. Status lines, alarms and the start checks' messages stay in English.
+
+Screenshots of each screen are in the add-on's repository, under
+`docs/img/ux13/`. The battery-mode screens are not built yet, so there are no
+screenshots of them.
+
+*For installers: regenerate the screenshots with
+`tools/ux13_screenshots.sh`, which serves the page from test fixtures.*
+
 ### Setup, for a new install
 
 The **Setup** tab walks an installer through six steps: the meter, the

goodwe_controller/app/homeview.py

@@ -16,7 +16,7 @@ section at the bottom and is held to STYLE.md by test_messages.py.
 
 from datetime import datetime, timedelta, timezone
 
-from . import arbitrage, messages, peakguard
+from . import arbitrage, messages, peakguard, uitext
 from .maintenance import CHARGE as M_CHARGE, DRAIN as M_DRAIN, HOLD as M_HOLD
 from .maintenance import IDLE as M_IDLE
 from .price import Absence, Uncertainty, brussels
@@ -54,18 +54,6 @@ def hhmm(t: datetime) -> str:
     return f"{brussels(t):%H:%M}"
 
 
-def _kw(w) -> str:
-    return f"{abs(float(w)) / 1000:.1f} kW"
-
-
-def _eur(v) -> str:
-    return f"€{float(v):.2f}"
-
-
-def _kwh(v) -> str:
-    return f"{float(v):.1f} kWh"
-
-
 # --------------------------------------------------------------------------- #
 # Now
 # --------------------------------------------------------------------------- #
@@ -490,8 +478,7 @@ def build_plan(c, now, shadow, running, held=False, settled=True):
         "day": brussels(now).date().isoformat(),
         "now_h": round(_hours(now, day0), 3),
         "hours": int(round(_hours(day1, day0))),
-        "verdict": (VERDICT[verdict_key] if settled or verdict_key != "held"
-                    else ZERO_GOING),
+        "verdict": verdict_words(verdict_key, settled),
         "verdict_key": verdict_key,
         "head": plan_head(verdict_key, shadow, settled),
         "prices": bars,
@@ -537,7 +524,7 @@ def battery_rows(c, shadow, running, held=False):
             "stored_kwh": (None if cap is None or inv.soc is None
                            else round(cap * float(inv.soc) / 100.0, 2)),
             "state": flow(inv.batt, shadow=shadow),
-            "mode": MODE_HOUSE,
+            "mode": mode_house(),
             "maintenance": phase,
             "now": battery_now(inv.soc, inv.batt, phase=phase, shadow=shadow,
                                running=running, held=held,
@@ -549,28 +536,6 @@ def battery_rows(c, shadow, running, held=False):
     return rows
 
 
-# Row id -> the title on Home. The row's own sentence is the body.
-ATTN_TITLES = {
-    "controller": "Control is not running",
-    "meter": "Meter reading",
-    "meter_frozen": messages.T_METER_FROZEN,
-    "freeze_check": "Stuck meter check",
-    "month_peak": "This month's peak",
-    "peak_guard": "Peak limit",
-    "peak_forecast": "Peak limit forecast",
-    "sensor": "Battery readings",
-    "control": "Inverter control",
-    "power_too_high": messages.T_OUTPUT_CLAMP,
-    "not_keeping_up": messages.T_LOOP_BOUND,
-    "write": "Power request not accepted",
-    "direction": "Power went the wrong way",
-    "site_direction": "Power went the wrong way",
-    "circulating": messages.T_CIRCULATING,
-    "delivery": messages.S_NOT_DELIVERING,
-    "estop": "Emergency stop",
-    "pv": "Solar reading",
-    None: "Inverter connection",
-}
 # Row id -> the DOCS.md heading under Notifications, where one exists.
 ATTN_DOCS = {
     "meter_frozen": messages.T_METER_FROZEN,
@@ -594,7 +559,7 @@ def attention(checks):
         sev = INFO if ok else (WARNING if warn else ALARM)
         rid = row.get("id")
         out.append({"severity": sev, "id": rid,
-                    "title": ATTN_TITLES.get(rid, ATTN_TITLES[None]),
+                    "title": attn_title(rid),
                     "body": row.get("text", ""),
                     "docs": ATTN_DOCS.get(rid)})
     out.sort(key=lambda a: rank[a["severity"]])
@@ -605,7 +570,7 @@ def month_peak(c, now):
     """This month's peak against the limit, and the 15-minute period so far."""
     limit_w = c.peak.cap_w  # the limit the controller parsed at start
     local = brussels(now)
-    out = {"month": f"{local:%B}", "limit_w": limit_w, "peak_w": None,
+    out = {"month": month_name(local), "limit_w": limit_w, "peak_w": None,
            "pct": None, "period_w": None, "state": "not_covered",
            "line": ""}
     if not c.p1_enabled:
@@ -644,8 +609,18 @@ def state_of(c, level, shadow):
     return "running"
 
 
-def build(c, *, level: str, checks: list, now: datetime | None = None) -> dict:
-    """The structured half of `/status`. Pure reads of the controller."""
+def build(c, *, level: str, checks: list, now: datetime | None = None,
+          lang: str = "en") -> dict:
+    """The structured half of `/status`, in `lang` (UX-13 P5). Pure reads of
+    the controller."""
+    _LANG[0] = uitext.lang_of(lang)
+    try:
+        return _build(c, level=level, checks=checks, now=now)
+    finally:
+        _LANG[0] = "en"
+
+
+def _build(c, *, level, checks, now):
     now = now or datetime.now(timezone.utc)
     shadow = bool(c.shadow)
     kind = state_of(c, level, shadow)
@@ -667,7 +642,7 @@ def build(c, *, level: str, checks: list, now: datetime | None = None) -> dict:
         "plan": build_plan(c, now, shadow, running, held=held,
                            settled=settled),
         "attention": ([{"severity": INFO, "id": "shadow",
-                         "title": ATTN_SHADOW, "body": attn_shadow_body(),
+                         "title": attn_shadow(), "body": attn_shadow_body(),
                          "docs": None}] if shadow else []) + attention(checks),
         "month_peak": month_peak(c, now),
         "control": {"running": bool(c.auto), "shadow": shadow,
@@ -687,279 +662,309 @@ def _docs_url():
 # The words. STYLE.md: plain, short, present tense. A plan line is at most
 # two sentences of at most 12 words each (UX-13 design, section 4); a title at
 # most 5 words; everything else one sentence of at most 25 words. In shadow
-# mode a text says what the add-on WOULD do. test_messages.py renders every
-# function below through `text_samples()` and checks it.
+# mode a text says what the add-on WOULD do. The sentences themselves are in
+# app/ui_text/<lang>.json under `home_words` (UX-13 P5: English and Dutch).
+# test_messages.py and test_ui_text.py render every function below through
+# `text_samples()` in each language and check it.
 # =========================================================================== #
-MODE_HOUSE = "Follows the house"
-ATTN_SHADOW = "Shadow mode is on"
+_LANG = ["en"]          # the language of the build in progress (build())
+_WORDS: dict = {}
+
+
+def _hw() -> dict:
+    lang = _LANG[0]
+    if lang not in _WORDS:
+        _WORDS[lang] = uitext.words(lang)
+    return _WORDS[lang]
+
+
+def _t(path, **values) -> str:
+    node = _hw()["home_words"]
+    for k in path.split("."):
+        node = node[k]
+    return uitext.say(node, **values)
+
+
+def _dec(text) -> str:
+    """A decimal comma in Dutch."""
+    return text.replace(".", ",") if _LANG[0] == "nl" else text
+
+
+def _kw(w) -> str:
+    return _dec(f"{abs(float(w)) / 1000:.1f}") + " kW"
+
+
+def _eur(v) -> str:
+    return "€" + _dec(f"{float(v):.2f}")
+
+
+def _kwh(v) -> str:
+    return _dec(f"{float(v):.1f}") + " kWh"
+
+
+# Row id -> the title on Home. The row's own sentence is the body, and it stays
+# in English (app/messages.py). Five titles are the notification's own title,
+# which test_ui_text.py checks.
+_EN = uitext.words("en")["home_words"]
+ATTN_TITLES = {(None if k == "none" else k): v for k, v in _EN["attn"].items()}
+ATTN_FROM_MESSAGES = {
+    "meter_frozen": messages.T_METER_FROZEN,
+    "power_too_high": messages.T_OUTPUT_CLAMP,
+    "not_keeping_up": messages.T_LOOP_BOUND,
+    "circulating": messages.T_CIRCULATING,
+    "delivery": messages.S_NOT_DELIVERING,
+}
+VERDICT = dict(_EN["verdict"])
+MODE_HOUSE, ATTN_SHADOW = _EN["mode_house"], _EN["attn_shadow"]
+ZERO_HELD, ZERO_GOING = _EN["zero_held"], _EN["zero_going"]
+
+
+def mode_house() -> str:
+    return _t("mode_house")
+
+
+def attn_shadow() -> str:
+    return _t("attn_shadow")
 
 
 def attn_shadow_body() -> str:
-    return "The add-on decides everything, but every inverter stays at 0 W."
-
-ZERO_HELD, ZERO_GOING = "Held at 0 W", "Going to 0 W"
-VERDICT = {
-    "held": ZERO_HELD,
-    "stopped": "Stopped",
-    "cycle": "Monthly cycle today",
-    "trade": "Trading on price",
-    "house": "Follows the house",
-}
+    return _t("attn_shadow_body")
 
 
-def _w(shadow, live, would):
-    return would if shadow else live
+def verdict_words(key, settled=True) -> str:
+    return _t("verdict." + key) if settled or key != "held" \
+        else _t("zero_going")
+
+
+def attn_title(rid) -> str:
+    table = _hw()["home_words"]["attn"]
+    return table.get(rid or "none", table["none"])
+
+
+def month_name(local) -> str:
+    return _hw()["home_words"]["months"][local.month - 1]
+
+
+def _w(shadow, key, **values) -> str:
+    """`key`, or its `key_would` form in shadow mode."""
+    return _t(key + "_would" if shadow else key, **values)
 
 
 def pill(kind) -> str:
-    return {"running": "Running", "shadow": "Shadow mode",
-            "stopped": "Stopped", "alarm": "Needs you now",
-            "warning": "Running, with a warning"}[kind]
+    return _t("pill." + kind)
 
 
 def banner_sub(kind) -> str:
-    return {
-        "running": "The batteries follow the plan below.",
-        "shadow": "The plans below say what the add-on would do.",
-        "stopped": "Start control below when you are ready.",
-        "alarm": "See Needs attention below for what to do.",
-        "warning": "See Needs attention below.",
-    }[kind]
+    return _t("banner_sub." + kind)
 
 
 def tile_solar(pv_w, has_solar) -> str:
     if not has_solar:
-        return "Not set up"
+        return _t("tile.not_set_up")
     if pv_w is None:
-        return "No reading"
-    return "Producing" if pv_w > IDLE_W else "Not producing"
+        return _t("tile.no_reading")
+    return _t("tile.producing") if pv_w > IDLE_W else _t("tile.not_producing")
 
 
 def tile_house(house_w, has_solar, disagree=False) -> str:
     if not has_solar:
-        return "Needs a solar reading"
+        return _t("tile.needs_solar")
     if disagree:
-        return "Readings do not add up"
-    return "No reading" if house_w is None else "Using"
+        return _t("tile.not_adding_up")
+    return _t("tile.no_reading") if house_w is None else _t("tile.using")
 
 
 def tile_grid(grid_w) -> str:
     if grid_w is None:
-        return "No reading"
+        return _t("tile.no_reading")
     if grid_w > IDLE_W:
-        return "Taking from the grid"
+        return _t("tile.taking")
     if grid_w < -IDLE_W:
-        return "Feeding in"
-    return "Balanced"
+        return _t("tile.feeding")
+    return _t("tile.balanced")
 
 
 def _zero(settled) -> str:
-    return ZERO_HELD if settled else ZERO_GOING
+    return _t("zero_held") if settled else _t("zero_going")
 
 
 def tile_batt(batt_w, shadow, settled=True) -> str:
     if shadow:
         return _zero(settled)
-    return {"giving": "Giving power", "charging": "Charging",
-            "resting": "Resting", None: "No reading"}[flow(batt_w)]
+    return _t("tile." + {"giving": "giving", "charging": "charging",
+                         "resting": "resting",
+                         None: "no_reading"}[flow(batt_w)])
 
 
 def battery_now(soc, batt_w, *, phase, shadow, running, held=False,
                 would_w=None, settled=True) -> str:
     if soc is None or batt_w is None:
-        return "No reading from this battery."
+        return _t("now.no_reading")
     zero = _zero(settled)
     if shadow:
         if would_w is None or abs(would_w) <= IDLE_W:
-            return f"{zero}. Would rest now."
-        verb = "give" if would_w > 0 else "charge"
-        return f"{zero}. Would {verb} {_kw(would_w)} now."
+            return _t("now.would_rest", zero=zero)
+        verb = "would_give" if would_w > 0 else "would_charge"
+        return _t("now." + verb, zero=zero, kw=_kw(would_w))
     if held:
-        return f"{zero} until the alarm clears."
+        return _t("now.held", zero=zero)
     if not running:
-        return f"{zero} while control is stopped."
+        return _t("now.stopped", zero=zero)
     if phase != M_IDLE:
-        return {M_DRAIN: "Monthly cycle: emptying.",
-                M_CHARGE: "Monthly cycle: refilling.",
-                M_HOLD: "Monthly cycle: holding full."}.get(
-                    phase, "Monthly cycle under way.")
+        return _t("now." + {M_DRAIN: "cycle_drain", M_CHARGE: "cycle_charge",
+                            M_HOLD: "cycle_hold"}.get(phase, "cycle"))
     st = flow(batt_w)
     if st == "giving":
-        return f"Giving {_kw(batt_w)} now."
+        return _t("now.giving", kw=_kw(batt_w))
     if st == "charging":
-        return f"Charging {_kw(batt_w)} now."
-    return "Resting now."
+        return _t("now.charging", kw=_kw(batt_w))
+    return _t("now.resting")
 
 
 def plan_head(key, shadow, settled=True) -> str:
     if key == "held":
-        return ("Every inverter is at 0 W until the alarm clears." if settled
-                else "Every inverter goes to 0 W until the alarm clears.")
+        return _t("head.held" if settled else "head.held_going")
     if key == "stopped":
-        return "Control is stopped, so nothing is planned."
+        return _t("head.stopped")
     if not shadow:
-        return {
-            "cycle": "A battery runs its monthly cycle today.",
-            "trade": "Charges in the cheapest hour, gives power in the dearest.",
-            "house": "Charges from spare solar and covers the house.",
-        }[key]
-    return "Shadow mode: this is what the add-on would do. " + {
-        "cycle": "A battery would run its monthly cycle today.",
-        "trade": "Would charge when cheapest and give power when dearest.",
-        "house": "Would charge from spare solar and cover the house.",
-    }[key]
+        return _t("head." + key)
+    return _t("head.shadow") + " " + _t("head." + key + "_would")
 
 
 def run_grid_what(kwh, shadow) -> str:
-    return _w(shadow, "Charges", "Would charge") + \
-        f" up to {_kwh(kwh)} from the grid."
+    return _w(shadow, "run.grid_what", kwh=_kwh(kwh))
 
 
 # The trade legs and the price line use the feed's own points (a 15-minute
 # period on a quarter-hourly feed), so both name the same price and time.
 def run_grid_why(price) -> str:
-    return f"Lowest published price, {_eur(price)} per kWh."
+    return _t("run.grid_why", eur=_eur(price))
 
 
 def run_grid_amount(eur) -> str:
-    return f"Costs up to {_eur(eur)}."
+    return _t("run.grid_amount", eur=_eur(eur))
 
 
 def run_give_what(kwh, shadow) -> str:
-    return _w(shadow, "Gives", "Would give") + \
-        f" up to {_kwh(kwh)}, to the house first."
+    return _w(shadow, "run.give_what", kwh=_kwh(kwh))
 
 
 def run_give_why(price) -> str:
-    return f"Highest published price, {_eur(price)} per kWh."
+    return _t("run.give_why", eur=_eur(price))
 
 
 def run_give_amount(eur) -> str:
-    return f"Worth up to {_eur(eur)} at that price."
+    return _t("run.give_amount", eur=_eur(eur))
 
 
 def run_cycle_what(phase, shadow) -> str:
-    if phase == M_IDLE:
-        return _w(shadow, "Starts", "Would start") + \
-            " the monthly battery cycle."
-    return _w(shadow, "Runs", "Would run") + " the monthly battery cycle now."
+    return _w(shadow, "run.cycle_start" if phase == M_IDLE else "run.cycle_now")
 
 
 def run_cycle_why(shadow=False) -> str:
-    return _w(shadow, "Empties, refills and holds full",
-              "Would empty, refill and hold full") + \
-        ", so the level reads right."
+    return _w(shadow, "run.cycle_why")
 
 
 def run_cycle_amount(hours) -> str:
     if hours is None:
-        return "How long depends on the battery."
-    return f"Takes about {max(1, round(hours))} hours."
+        return _t("run.cycle_amount_unknown")
+    return _t("run.cycle_amount", hours=max(1, round(hours)))
 
 
 def run_peak_what(limit_w, shadow) -> str:
-    return _w(shadow, "Gives", "Would give") + \
-        f" power to stay under {_kw(limit_w)}."
+    return _w(shadow, "run.peak_what", kw=_kw(limit_w))
 
 
 def run_peak_why() -> str:
-    return "The peak limit comes before everything else."
+    return _t("run.peak_why")
 
 
 def run_house_what(shadow) -> str:
-    return _w(shadow, "Follows", "Would follow") + " the house."
+    return _w(shadow, "run.house_what")
 
 
 def run_house_why(shadow=False) -> str:
-    return _w(shadow, "Charges from spare solar, gives power",
-              "Would charge from spare solar, give power") + \
-        " when the house needs it."
+    return _w(shadow, "run.house_why")
 
 
 def run_house_amount() -> str:
-    return "Amounts depend on the sun and the house."
+    return _t("run.house_amount")
 
 
 def line_no_trade(key) -> str:
-    return {
-        "off": "",
-        "not_covered": "No trading on price: nothing measures the 15-minute "
-                       "peak.",
-        "no_prices": "No trading on price yet: no prices have arrived.",
-        "peak": "No trading on price now: the peak limit comes first.",
-        "not_firm": "No trading on price yet: the prices are not published.",
-        "not_worth": "No trading on price today. The price gap is too small.",
-        "no_level": "No trading on price now: a battery level is unknown.",
-    }[key]
+    return "" if key == "off" else _t("no_trade." + key)
 
 
 def line_trade_tomorrow(kind, at, price, shadow) -> str:
-    verb = {"grid": _w(shadow, "Charges", "Would charge"),
-            "give": _w(shadow, "Gives power", "Would give power")}[kind]
-    return f"Tomorrow: {verb.lower()} at {at}, {_eur(price)} per kWh."
+    return _w(shadow, "tomorrow_trade." + kind, at=at, eur=_eur(price))
 
 
 def line_cycle_waits(name) -> str:
-    return f"{name} waits its turn for the monthly cycle."
+    return _t("cycle_waits", name=name)
 
 
 def line_peak_limit(limit_w, shadow) -> str:
-    return _w(shadow, "The batteries step in", "The batteries would step in") \
-        + f" above {_kw(limit_w)}."
+    return _w(shadow, "step_in", kw=_kw(limit_w))
 
 
 def line_prices(now_eur, lo, hi) -> str:
     parts = []
     if now_eur is not None:
-        parts.append(f"Price now {_eur(now_eur)} per kWh, all in.")
+        parts.append(_t("prices.now", eur=_eur(now_eur)))
     if lo is not None and hi is not None:
-        parts.append(f"Today: lowest {_eur(lo['eur_kwh'])} at "
-                     f"{lo['label']}, highest {_eur(hi['eur_kwh'])} at "
-                     f"{hi['label']}.")
-    return " ".join(parts) or "No prices for today."
+        parts.append(_t("prices.today", lo=_eur(lo["eur_kwh"]),
+                        lo_at=lo["label"], hi=_eur(hi["eur_kwh"]),
+                        hi_at=hi["label"]))
+    return " ".join(parts) or _t("prices.none")
 
 
 def line_tomorrow(known) -> str:
-    return ("Tomorrow's prices are in." if known else
-            "Tomorrow's prices usually arrive after 13:00.")
+    return _t("tomorrow.known" if known else "tomorrow.unknown")
 
 
 def line_region(rid, year) -> str:
     if rid in REGION_PRESETS and year:
-        return f"Levies and VAT: {REGION_WORDS.get(rid, rid)}, {year} figures."
-    return "Levies and VAT: your own figure."
-
-
-REGION_WORDS = {"flanders": "Flanders, Fluvius Antwerpen"}
+        name = _hw()["choices"]["region"].get(rid, rid)
+        return _t("region.preset", region=name, year=year)
+    return _t("region.own")
 
 
 def line_peak_not_covered() -> str:
-    return "No peak limit: this meter does not measure 15-minute periods."
+    return _t("peak_not_covered")
 
 
 def line_period(period_w, limit_w, shadow) -> str:
-    step = _w(shadow, "The batteries step in", "The batteries would step in")
+    step = _w(shadow, "step_in", kw=_kw(limit_w))
     if period_w is None:
-        return f"{step} above {_kw(limit_w)}."
-    return (f"This 15-minute period is heading for {_kw(period_w)}. "
-            f"{step} above {_kw(limit_w)}.")
+        return step
+    return _t("period", kw=_kw(period_w)) + " " + step
 
 
 def control_text(running, shadow) -> str:
     if shadow:
-        return "Shadow mode: every inverter stays at 0 W."
+        return _t("control.shadow")
     if running:
-        return "Control is running."
-    return "Control is stopped. Every inverter is at 0 W."
+        return _t("control.running")
+    return _t("control.stopped")
 
 
-def text_samples() -> list:
-    """`(kind, text)` for every sentence above, rendered with real values, so
-    test_messages.py can hold each to its STYLE limit. Kinds: title, plan
-    (2 sentences of 12 words), line (1 sentence of 25 words)."""
-    out = [("title", t) for t in VERDICT.values()] + [("title", ZERO_GOING)]
-    out += [("title", t) for t in ATTN_TITLES.values()]
-    out += [("title", MODE_HOUSE), ("title", ATTN_SHADOW),
+def text_samples(lang="en") -> list:
+    """`(kind, text)` for every sentence above in `lang`, rendered with real
+    values, so test_messages.py can hold each to its STYLE limit. Kinds: title,
+    plan (2 sentences of 12 words), line (1 sentence of 25 words)."""
+    _LANG[0] = uitext.lang_of(lang)
+    try:
+        return _samples()
+    finally:
+        _LANG[0] = "en"
+
+
+def _samples() -> list:
+    words = _hw()["home_words"]
+    out = [("title", t) for t in words["verdict"].values()]
+    out += [("title", _t("zero_going")), ("title", _t("zero_held"))]
+    out += [("title", t) for t in words["attn"].values()]
+    out += [("title", mode_house()), ("title", attn_shadow()),
             ("line", attn_shadow_body())]
     for k in ("running", "shadow", "stopped", "alarm", "warning"):
         out += [("title", pill(k)), ("line", banner_sub(k))]

goodwe_controller/app/main.py

@@ -5544,7 +5544,7 @@ class Controller:
                                 _inv_list.index(ent) + 1)})
         return out
 
-    def status_payload(self) -> dict:
+    def status_payload(self, lang: str = "en") -> dict:
         checks = self.checks()
         bad = [c for c in checks if not c["ok"] and not c["warn"]]
         # --- SAFETY-10, AND IT IS FIRST IN THE CASCADE -----------------------
@@ -5730,7 +5730,8 @@ class Controller:
         # never cost the page its rows: a fault here is logged and the old
         # fields are served alone (the page then shows the installer details).
         try:
-            out.update(homeview.build(self, level=level, checks=checks))
+            out.update(homeview.build(self, level=level, checks=checks,
+                                      lang=lang))
         except Exception:                               # noqa: BLE001
             # Once per process at ERROR: the page polls every 3 s.
             if not getattr(self, "_home_failed", False):

goodwe_controller/app/setuponly.py

@@ -52,7 +52,7 @@ class SetupOnly:
         if hint is not None:
             self.hint = f"{datetime.now().astimezone():%H:%M} {hint}"
 
-    def status_payload(self) -> dict:
+    def status_payload(self, lang: str = "en") -> dict:
         return {"setup_only": True, "mode": "setup_only",
                 "banner": messages.banner_setup_only(), "level": "warn",
                 "rows": [["Control", "not started, in setup"]],

goodwe_controller/app/static/app.css

@@ -206,6 +206,10 @@ input:disabled{opacity:.6}
 .ent-all{display:flex;gap:6px;padding:6px 10px;align-items:center;min-height:44px}
 .elist .erow{padding:6px 0;border-bottom:1px dashed var(--line)}
 .elist>.btn{margin-top:8px}
+.plist .prow{display:grid;gap:6px}
+.plist .pf{display:flex;flex-direction:column;gap:2px}
+.plist .pf>select.sel{width:100%}
+input.txt.time{width:5.5em;text-align:center;font-variant-numeric:tabular-nums}
 .inv{border:1px solid var(--line);border-radius:10px;padding:0 12px;margin:10px 0}
 .inv>.hd{display:flex;align-items:center;gap:8px;padding:10px 0;border-bottom:1px solid var(--line);font-weight:600;flex-wrap:wrap}
 .inv>.f:nth-child(2){border-top:0}

goodwe_controller/app/static/app.js

@@ -5,7 +5,19 @@
    labels) or from /status (sentences built by app/homeview.py), so STYLE.md
    is checked in Python. Data is always set as text, never as HTML. */
 (function () {
-  const T = JSON.parse(document.getElementById("ui-text").textContent).home;
+  // P5: English or Dutch, by the browser's language. A word missing in Dutch
+  // falls back to English, key by key (app/uitext.py does the same).
+  const ALL = JSON.parse(document.getElementById("ui-text").textContent);
+  const LANG = /^nl\b/i.test(navigator.language || "") ? "nl" : "en";
+  const merge = (a, b) => {
+    if (!b || typeof a !== "object" || typeof b !== "object" || Array.isArray(a)) return b ?? a;
+    const out = Object.assign({}, a);
+    for (const k in b) out[k] = k in a ? merge(a[k], b[k]) : b[k];
+    return out;
+  };
+  const WORDS = LANG === "en" ? ALL.en : merge(ALL.en, ALL[LANG]);
+  document.documentElement.lang = LANG;
+  const T = WORDS.home;
   const $ = (s) => document.querySelector(s);
   const t = (path) => path.split(".").reduce((o, k) => (o == null ? o : o[k]), T);
   function h(tag, attrs, ...kids) {
@@ -24,8 +36,9 @@
     }
     return e;
   }
-  const kw = (w) => (Math.abs(Number(w)) / 1000).toFixed(1);
-  const eur = (v) => "€" + Number(v).toFixed(2);
+  const dec = (x) => (LANG === "nl" ? x.replace(".", ",") : x);
+  const kw = (w) => dec((Math.abs(Number(w)) / 1000).toFixed(1));
+  const eur = (v) => "€" + dec(Number(v).toFixed(2));
 
   // Fixed labels from ui_text.
   document.querySelectorAll("[data-t]").forEach((e) => { e.textContent = t(e.dataset.t) || ""; });
@@ -55,7 +68,7 @@
 
   /* ---------------- data ---------------- */
   async function getStatus() {
-    const r = await fetch("status", { cache: "no-store" });
+    const r = await fetch("status?lang=" + LANG, { cache: "no-store" });
     if (!r.ok) throw new Error("status " + r.status);
     return r.json();
   }
@@ -87,7 +100,7 @@
     const st = S.state || null;
     const dot = st ? ({ running: "", shadow: " warn", stopped: " warn", warning: " warn", alarm: " bad" }[st.kind] ?? " warn")
                    : (S.level === "ok" ? "" : S.level === "bad" ? " bad" : " warn");
-    const words = st ? [st.pill, st.ran].filter(Boolean).join(". ") : S.banner;
+    const words = st ? [st.pill, st.ran].filter(Boolean).join(". ") : S.setup_only === true ? t("setup_only.name") : S.banner;
     $("#pill").replaceChildren(h("span", { class: "dot" + dot, "aria-hidden": "true" }), h("span", {}, words));
   }
 
@@ -96,7 +109,7 @@
     const structured = S.now && S.plan && !S.home_error;
     // UX-15: setup-only mode commands nothing and has no control to offer.
     const setup = S.setup_only === true;
-    banner($("#home-banner"), S.level, S.banner, structured ? S.state.sub : setup ? t("setup_only.description") : "", S.level === "bad" ? "alert" : null);
+    banner($("#home-banner"), S.level, setup ? t("setup_only.name") : S.banner, structured ? S.state.sub : setup ? t("setup_only.description") : "", S.level === "bad" ? "alert" : null);
     ["#c-now", "#c-plan", "#c-peak", "#c-attn"].forEach((id) => { $(id).hidden = !structured; });
     if (structured) { renderNow(); renderPlan(); renderPeak(); renderAttention(); }
     renderControl(structured, setup);
@@ -303,7 +316,7 @@
       levelBar(b.level_pct, b.name),
       h("dl", { class: "kv" },
         h("dt", {}, t("batteries.level")), h("dd", {}, b.level_pct == null ? "–" : Math.round(b.level_pct) + " %"),
-        b.stored_kwh != null ? [h("dt", {}, t("batteries.stored")), h("dd", {}, b.stored_kwh.toFixed(1) + " kWh")] : null,
+        b.stored_kwh != null ? [h("dt", {}, t("batteries.stored")), h("dd", {}, dec(b.stored_kwh.toFixed(1)) + " kWh")] : null,
         h("dt", {}, t("batteries.now")), h("dd", {}, b.now),
         h("dt", {}, t("batteries.mode")), h("dd", {}, b.mode)))));
   }
@@ -339,7 +352,7 @@
   // Shared with settings.js, which loads after this file.
   // `first`: the page opened with no route, so settings.js may open the setup
   // wizard on a new install (UX-13 P4).
-  window.UX13 = { h, ask, toast, t, maint: (what) => ask(what, () => simple(what)), first: !location.hash };
+  window.UX13 = { h, ask, toast, t, words: WORDS, lang: LANG, maint: (what) => ask(what, () => simple(what)), first: !location.hash };
 
   /* ---------------- tabs: hash routes, arrow keys ---------------- */
   const TABS = [...document.querySelectorAll(".tab")];

goodwe_controller/app/static/settings.js

@@ -9,9 +9,9 @@
    P4: the Setup tab's wizard is the same page model, drawn one step at a
    time from each field's `wizard` step, and saved through the same routes. */
 (function () {
-  const ROOT = JSON.parse(document.getElementById("ui-text").textContent);
+  const ROOT = window.UX13.words;       // English or Dutch (app.js)
   const W = ROOT.settings;
-  const { h, ask, toast, maint } = window.UX13;
+  const { h, ask, toast, maint, lang } = window.UX13;
   const $ = (s) => document.querySelector(s);
   const ws = (path) => path.split(".").reduce((o, k) => (o == null ? o : o[k]), W);
   const clone = (x) => (x === undefined ? undefined : JSON.parse(JSON.stringify(x)));
@@ -288,8 +288,45 @@
     box.append(h("button", { type: "button", class: "btn", onclick: () => put(f, card, arr().concat([{ entity: "", reversed: false }]), true) }, "+ " + W.add_solar));
     return box;
   }
+  // P5: time windows, each a start, an end, its days and a price. The add-on
+  // builds the tariff from the rows and names the first overlap or gap.
+  function periodList(f, card) {
+    const P = W.periods;
+    const arr = () => (Array.isArray(get(f, card)) ? get(f, card) : []);
+    const box = h("div", { class: "elist plist" });
+    if (!Array.isArray(get(f, card))) return h("div", { class: "msg info" }, W.derive.custom_profile.description);
+    arr().forEach((row, i) => {
+      const set = (k, v) => { const a = clone(arr()); a[i][k] = v; put(f, card, a); };
+      const say = (what) => P.window + " " + (i + 1) + ", " + what;
+      const time = (k) => {
+        const e = h("input", { class: "txt time", type: "text", inputmode: "numeric", maxlength: "5", placeholder: "00:00",
+                               value: row[k] == null ? "" : row[k], autocomplete: "off", spellcheck: "false", "aria-label": say(P[k]) });
+        e.addEventListener("input", () => set(k, e.value.trim()));
+        return e;
+      };
+      const days = h("select", { class: "sel", "aria-label": say(P.days) });
+      for (const [v, label] of f.days || []) days.append(h("option", { value: v, selected: v === row.days }, label));
+      days.addEventListener("change", () => set("days", days.value));
+      const price = h("input", { class: "num", type: "number", inputmode: "decimal", step: "0.01",
+                                 value: row.price == null ? "" : row.price, "aria-label": say(P.price) });
+      price.addEventListener("input", () => set("price", price.value === "" || isNaN(+price.value) ? null : +price.value));
+      const cell = (label, ...kids) => h("label", { class: "pf" }, h("span", { class: "tiny muted" }, label), ...kids);
+      box.append(h("div", { class: "erow prow" },
+        h("div", { class: "row spread" }, h("strong", { class: "small" }, P.window + " " + (i + 1)),
+          h("button", { type: "button", class: "btn link tiny", onclick: () => { const a = clone(arr()); a.splice(i, 1); put(f, card, a, true); } }, W.remove)),
+        h("div", { class: "row" }, cell(P.from, time("from")), cell(P.to, time("to")),
+          cell(P.price, h("span", { class: "row" }, price, f.unit ? h("span", { class: "unit" }, f.unit) : null))),
+        cell(P.days, days)));
+    });
+    box.append(h("button", { type: "button", class: "btn", onclick: () => {
+      const a = arr(), last = a[a.length - 1];
+      put(f, card, clone(a).concat([{ from: last ? last.to : "00:00", to: "24:00", days: last ? last.days : "mon-sun", price: null }]), true);
+    } }, "+ " + P.add));
+    return box;
+  }
   const CONTROLS = { toggle, segmented: (f, c, l) => radios(f, c, l, false), choice: (f, c, l) => radios(f, c, l, true),
-                     select, slider, number, text, locked, entity, entity_list: entityList, solar_list: solarList };
+                     select, slider, number, text, locked, entity, entity_list: entityList, solar_list: solarList,
+                     period_list: periodList };
 
   /* ---------------- rows, cards and groups ---------------- */
   function keyText(f, card) {
@@ -304,7 +341,7 @@
     const msg = h("div", { class: "msgs" });
     const make = CONTROLS[f.control] || text;
     const row = h("div", { class: "f" + (f.control === "toggle" ? " inline" : ""), "data-key": f.key, "data-card": card },
-      h("div", { class: "head" }, h("div", { class: "lbl", id: lid }, f.label, f.unit && f.control !== "slider" && f.control !== "number" && f.control !== "locked" ? " (" + f.unit + ")" : ""),
+      h("div", { class: "head" }, h("div", { class: "lbl", id: lid }, f.label, f.unit && !["slider", "number", "locked", "period_list"].includes(f.control) ? " (" + f.unit + ")" : ""),
         keys ? h("div", { class: "key" }, keys) : null),
       h("div", { class: "ctl" }, make(f, card, lid)),
       f.help ? h("div", { class: "help" }, f.help) : null, msg);
@@ -469,7 +506,7 @@
     const seq = ++vseq;
     try {
       const r = await fetch("config/validate", { method: "POST", headers: { "Content-Type": "application/json" },
-                                                 body: JSON.stringify(Object.assign({ model: V }, extra || {})) });
+                                                 body: JSON.stringify(Object.assign({ model: V, lang }, extra || {})) });
       const b = await r.json();
       if (seq !== vseq) return null;
       MSG = b.messages || [];
@@ -498,7 +535,7 @@
   async function load(after) {
     let m;
     try {
-      const r = await fetch("config/model?lang=en", { cache: "no-store" });
+      const r = await fetch("config/model?lang=" + lang, { cache: "no-store" });
       if (!r.ok) throw new Error("model " + r.status);
       m = await r.json();
       if (!m.layout || !m.ui) throw new Error("no layout");
@@ -538,7 +575,7 @@
   // what is stored now (UX-15 F2).
   async function postSave(extra) {
     const r = await fetch("config/save", { method: "POST", headers: { "Content-Type": "application/json" },
-                                           body: JSON.stringify(Object.assign({ model: V, base: ORIG, fingerprint: FP }, extra || {})) });
+                                           body: JSON.stringify(Object.assign({ model: V, base: ORIG, fingerprint: FP, lang }, extra || {})) });
     const b = await r.json().catch(() => ({}));
     if (r.status === 409 && b.kind === "stale") FP = b.fingerprint || FP;
     return { r, b };

goodwe_controller/app/ui_text/en.json

@@ -24,7 +24,8 @@
     "fallback": {"name": "Price when the feed is down", "description": "Used when the price source does not answer."},
     "fixed_price": {"name": "Price per kWh, all in", "description": "Energy, supplier costs, grid costs, levies and VAT together."},
     "day_price": {"name": "Day price, weekdays 07:00 to 22:00", "description": "All in, as on your bill."},
-    "night_price": {"name": "Night and weekend price", "description": "All in, as on your bill."}
+    "night_price": {"name": "Night and weekend price", "description": "All in, as on your bill."},
+    "periods": {"name": "Time windows and prices", "description": "One price per kWh for each time window, all in, as on your bill."}
   },
   "choices": {
     "contract": {"none": "No prices", "fixed": "Fixed price", "daynight": "Day and night", "dynamic": "Dynamic, hourly", "custom": "Other time windows"},
@@ -34,7 +35,8 @@
     "meter_phases": {"1": "1 phase", "3": "3 phases"},
     "shadow_mode": {"auto": "Automatic", "on": "Always on", "off": "Off"},
     "price_provider": {"generic_dayahead": "Day-ahead market price", "custom_formula": "Your own price formula", "manual_csv": "A price file"},
-    "log_level": {"trace": "Everything, for support", "debug": "Detailed, to find a problem", "info": "Normal", "warning": "Warnings and errors", "error": "Errors only"}
+    "log_level": {"trace": "Everything, for support", "debug": "Detailed, to find a problem", "info": "Normal", "warning": "Warnings and errors", "error": "Errors only"},
+    "period_days": {"mon-sun": "Every day", "mon-fri": "Monday to Friday", "sat,sun": "Saturday and Sunday", "mon": "Monday", "tue": "Tuesday", "wed": "Wednesday", "thu": "Thursday", "fri": "Friday", "sat": "Saturday", "sun": "Sunday"}
   },
   "applies": {
     "restart": {"name": "Applies after a restart"},
@@ -79,7 +81,7 @@
     },
     "toast": {"started": "Control started.", "stopped": "Control stopped.", "done": "Done.", "failed": "That did not work. Try again."},
     "offline": {"name": "Cannot reach the add-on", "description": "The page tries again every 3 seconds."},
-    "setup_only": {"description": "Nothing is sent to any inverter until setup is saved and the add-on restarts.", "control": "Control starts after setup.", "open": "Open Setup"},
+    "setup_only": {"name": "Setup: nothing is controlled yet", "description": "Nothing is sent to any inverter until setup is saved and the add-on restarts.", "control": "Control starts after setup.", "open": "Open Setup"},
     "batteries": {"name": "Batteries", "description": "Battery modes and on and off switches arrive in a later update.", "level": "Level", "now": "Now", "stored": "Stored", "mode": "Mode", "settings": "Change inverter settings"},
     "settings": {"name": "Settings", "description": "The settings are grouped by task below.", "open": "Open the settings page"}
   },
@@ -127,6 +129,7 @@
     "remove": "Remove",
     "add_row": "Add a row",
     "add_solar": "Add a solar inverter",
+    "periods": {"window": "Window", "from": "From", "to": "To", "days": "Days", "price": "Price", "add": "Add a time window"},
     "reversed": "Reads negative",
     "phase": "Phase",
     "raw_roster": {"description": "This inverter list can only be changed in the Configuration tab."},
@@ -156,6 +159,13 @@
       "no_source": {"description": "Choose where the dynamic prices come from."},
       "custom_profile": {"description": "Other time windows can only be changed in the Configuration tab."},
       "no_price": {"description": "Enter a price per kWh."},
+      "no_periods": {"description": "Add at least one time window."},
+      "period_time": {"description": "Window {row}: write each time as hours and minutes, like 07:00 or 24:00."},
+      "period_zero": {"description": "Window {row} starts and ends at the same time, so change one of them."},
+      "period_price": {"description": "Window {row}: enter a price per kWh."},
+      "period_price_range": {"description": "Window {row}: enter the price in euro per kWh, like 0.34."},
+      "period_overlap": {"description": "Windows {a} and {b} both cover {day} {from} to {to}, so change one of them."},
+      "period_gap": {"description": "No window covers {day} {from} to {to}, so add one or widen one."},
       "unknown": {"description": "The page cannot store this choice, so reload the page."}
     },
     "setup": {
@@ -215,5 +225,160 @@
       "restart_failed": {"name": "Saved, not running yet", "description": "The restart did not go through, so press Restart now to apply the settings."},
       "home": "Open Home"
     }
+  },
+  "home_words": {
+    "mode_house": "Follows the house",
+    "attn_shadow": "Shadow mode is on",
+    "attn_shadow_body": "The add-on decides everything, but every inverter stays at 0 W.",
+    "zero_held": "Held at 0 W",
+    "zero_going": "Going to 0 W",
+    "verdict": {
+      "held": "Held at 0 W",
+      "stopped": "Stopped",
+      "cycle": "Monthly cycle today",
+      "trade": "Trading on price",
+      "house": "Follows the house"
+    },
+    "pill": {
+      "running": "Running",
+      "shadow": "Shadow mode",
+      "stopped": "Stopped",
+      "alarm": "Needs you now",
+      "warning": "Running, with a warning"
+    },
+    "banner_sub": {
+      "running": "The batteries follow the plan below.",
+      "shadow": "The plans below say what the add-on would do.",
+      "stopped": "Start control below when you are ready.",
+      "alarm": "See Needs attention below for what to do.",
+      "warning": "See Needs attention below."
+    },
+    "tile": {
+      "not_set_up": "Not set up",
+      "no_reading": "No reading",
+      "producing": "Producing",
+      "not_producing": "Not producing",
+      "needs_solar": "Needs a solar reading",
+      "not_adding_up": "Readings do not add up",
+      "using": "Using",
+      "taking": "Taking from the grid",
+      "feeding": "Feeding in",
+      "balanced": "Balanced",
+      "giving": "Giving power",
+      "charging": "Charging",
+      "resting": "Resting"
+    },
+    "now": {
+      "no_reading": "No reading from this battery.",
+      "would_rest": "{zero}. Would rest now.",
+      "would_give": "{zero}. Would give {kw} now.",
+      "would_charge": "{zero}. Would charge {kw} now.",
+      "held": "{zero} until the alarm clears.",
+      "stopped": "{zero} while control is stopped.",
+      "cycle_drain": "Monthly cycle: emptying.",
+      "cycle_charge": "Monthly cycle: refilling.",
+      "cycle_hold": "Monthly cycle: holding full.",
+      "cycle": "Monthly cycle under way.",
+      "giving": "Giving {kw} now.",
+      "charging": "Charging {kw} now.",
+      "resting": "Resting now."
+    },
+    "head": {
+      "held": "Every inverter is at 0 W until the alarm clears.",
+      "held_going": "Every inverter goes to 0 W until the alarm clears.",
+      "stopped": "Control is stopped, so nothing is planned.",
+      "cycle": "A battery runs its monthly cycle today.",
+      "trade": "Charges in the cheapest hour, gives power in the dearest.",
+      "house": "Charges from spare solar and covers the house.",
+      "shadow": "Shadow mode: this is what the add-on would do.",
+      "cycle_would": "A battery would run its monthly cycle today.",
+      "trade_would": "Would charge when cheapest and give power when dearest.",
+      "house_would": "Would charge from spare solar and cover the house."
+    },
+    "run": {
+      "grid_what": "Charges up to {kwh} from the grid.",
+      "grid_what_would": "Would charge up to {kwh} from the grid.",
+      "grid_why": "Lowest published price, {eur} per kWh.",
+      "grid_amount": "Costs up to {eur}.",
+      "give_what": "Gives up to {kwh}, to the house first.",
+      "give_what_would": "Would give up to {kwh}, to the house first.",
+      "give_why": "Highest published price, {eur} per kWh.",
+      "give_amount": "Worth up to {eur} at that price.",
+      "cycle_start": "Starts the monthly battery cycle.",
+      "cycle_start_would": "Would start the monthly battery cycle.",
+      "cycle_now": "Runs the monthly battery cycle now.",
+      "cycle_now_would": "Would run the monthly battery cycle now.",
+      "cycle_why": "Empties, refills and holds full, so the level reads right.",
+      "cycle_why_would": "Would empty, refill and hold full, so the level reads right.",
+      "cycle_amount_unknown": "How long depends on the battery.",
+      "cycle_amount": "Takes about {hours} hours.",
+      "peak_what": "Gives power to stay under {kw}.",
+      "peak_what_would": "Would give power to stay under {kw}.",
+      "peak_why": "The peak limit comes before everything else.",
+      "house_what": "Follows the house.",
+      "house_what_would": "Would follow the house.",
+      "house_why": "Charges from spare solar, gives power when the house needs it.",
+      "house_why_would": "Would charge from spare solar, give power when the house needs it.",
+      "house_amount": "Amounts depend on the sun and the house."
+    },
+    "no_trade": {
+      "not_covered": "No trading on price: nothing measures the 15-minute peak.",
+      "no_prices": "No trading on price yet: no prices have arrived.",
+      "peak": "No trading on price now: the peak limit comes first.",
+      "not_firm": "No trading on price yet: the prices are not published.",
+      "not_worth": "No trading on price today. The price gap is too small.",
+      "no_level": "No trading on price now: a battery level is unknown."
+    },
+    "tomorrow_trade": {
+      "grid": "Tomorrow: charges at {at}, {eur} per kWh.",
+      "grid_would": "Tomorrow: would charge at {at}, {eur} per kWh.",
+      "give": "Tomorrow: gives power at {at}, {eur} per kWh.",
+      "give_would": "Tomorrow: would give power at {at}, {eur} per kWh."
+    },
+    "cycle_waits": "{name} waits its turn for the monthly cycle.",
+    "step_in": "The batteries step in above {kw}.",
+    "step_in_would": "The batteries would step in above {kw}.",
+    "period": "This 15-minute period is heading for {kw}.",
+    "prices": {
+      "now": "Price now {eur} per kWh, all in.",
+      "today": "Today: lowest {lo} at {lo_at}, highest {hi} at {hi_at}.",
+      "none": "No prices for today."
+    },
+    "tomorrow": {
+      "known": "Tomorrow's prices are in.",
+      "unknown": "Tomorrow's prices usually arrive after 13:00."
+    },
+    "region": {
+      "preset": "Levies and VAT: {region}, {year} figures.",
+      "own": "Levies and VAT: your own figure."
+    },
+    "peak_not_covered": "No peak limit: this meter does not measure 15-minute periods.",
+    "control": {
+      "shadow": "Shadow mode: every inverter stays at 0 W.",
+      "running": "Control is running.",
+      "stopped": "Control is stopped. Every inverter is at 0 W."
+    },
+    "attn": {
+      "controller": "Control is not running",
+      "meter": "Meter reading",
+      "meter_frozen": "Meter reading may be stuck",
+      "freeze_check": "Stuck meter check",
+      "month_peak": "This month's peak",
+      "peak_guard": "Peak limit",
+      "peak_forecast": "Peak limit forecast",
+      "sensor": "Battery readings",
+      "control": "Inverter control",
+      "power_too_high": "Power request too high",
+      "not_keeping_up": "Battery is not keeping up",
+      "write": "Power request not accepted",
+      "direction": "Power went the wrong way",
+      "site_direction": "Power went the wrong way",
+      "circulating": "Inverters working against each other",
+      "delivery": "An inverter is not delivering",
+      "estop": "Emergency stop",
+      "pv": "Solar reading",
+      "none": "Inverter connection"
+    },
+    "months": ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]
   }
 }

goodwe_controller/app/ui_text/nl.json

@@ -0,0 +1,307 @@
+{
+  "groups": {
+    "meter": {"name": "Meter", "description": "Waar de meting van het net vandaan komt."},
+    "inverters": {"name": "Omvormers en batterijen", "description": "De omvormers die de add-on regelt, en uw zonnepanelen."},
+    "tariff": {"name": "Tarief en prijzen", "description": "Wat u per kWh betaalt en terugkrijgt."},
+    "safety": {"name": "Veiligheidsgrenzen", "description": "De piekgrens, starten en stoppen, en de veiligheidsstops."},
+    "maintenance": {"name": "Onderhoud", "description": "De maandelijkse batterijcyclus en het logboek."},
+    "tuning": {"name": "Afstelling van de regeling", "description": "Alleen voor support, want deze zijn gemeten op echte hardware."}
+  },
+  "parts": {
+    "meter.timing": {"name": "Timing"},
+    "inverters.solar": {"name": "Zonnepanelen"},
+    "tariff.selling": {"name": "Laden en verkopen op prijs"},
+    "tariff.feed": {"name": "Details van de prijsfeed"},
+    "safety.peak": {"name": "Piekgrens"},
+    "safety.start": {"name": "Starten en stoppen"},
+    "safety.stops": {"name": "Veiligheidsstops", "description": "Gemeten op echte hardware, dus laat ze zoals ze zijn."},
+    "maintenance.support": {"name": "Support"}
+  },
+  "fields": {
+    "solar": {"name": "Omvormers van de zonnepanelen", "description": "De vermogenssensor van elke zonne-omvormer, die de add-on bijhoudt maar niet gebruikt om te regelen."},
+    "contract": {"name": "Uw contract", "description": "Hoe uw leverancier elke kWh prijst die u van het net afneemt."},
+    "region": {"name": "Regio", "description": "Vult nettarieven, heffingen en btw in voor het getoonde jaar, nog niet voor Wallonië of Brussel, dus kijk uw factuur na."},
+    "fallback": {"name": "Prijs als de feed wegvalt", "description": "Gebruikt als de prijsbron niet antwoordt."},
+    "fixed_price": {"name": "Prijs per kWh, alles inbegrepen", "description": "Energie, kosten van de leverancier, nettarieven, heffingen en btw samen."},
+    "day_price": {"name": "Dagprijs, weekdagen 07:00 tot 22:00", "description": "Alles inbegrepen, zoals op uw factuur."},
+    "night_price": {"name": "Nacht- en weekendprijs", "description": "Alles inbegrepen, zoals op uw factuur."},
+    "periods": {"name": "Tijdvakken en prijzen", "description": "Eén prijs per kWh voor elk tijdvak, alles inbegrepen, zoals op uw factuur."}
+  },
+  "choices": {
+    "contract": {"none": "Geen prijzen", "fixed": "Vaste prijs", "daynight": "Dag en nacht", "dynamic": "Dynamisch, per uur", "custom": "Andere tijdvakken"},
+    "fallback": {"none": "Geen", "fixed": "Eén prijs", "daynight": "Dag en nacht", "custom": "Andere tijdvakken"},
+    "region": {"flanders": "Vlaanderen, Fluvius Antwerpen", "own": "Ik vul zelf een bedrag in"},
+    "meter_source": {"off": "Eén entiteit voor netvermogen", "ha_dsmr": "Entiteiten voor afname en injectie", "mqtt_p1": "Meter via MQTT", "ha_signed": "Eén entiteit voor nettovermogen", "homewizard_local": "HomeWizard-meter op het netwerk"},
+    "meter_phases": {"1": "1 fase", "3": "3 fasen"},
+    "shadow_mode": {"auto": "Automatisch", "on": "Altijd aan", "off": "Uit"},
+    "price_provider": {"generic_dayahead": "Day-aheadprijs van de markt", "custom_formula": "Uw eigen prijsformule", "manual_csv": "Een prijsbestand"},
+    "log_level": {"trace": "Alles, voor support", "debug": "Uitgebreid, om een probleem te vinden", "info": "Normaal", "warning": "Waarschuwingen en fouten", "error": "Alleen fouten"},
+    "period_days": {"mon-sun": "Elke dag", "mon-fri": "Maandag tot vrijdag", "sat,sun": "Zaterdag en zondag", "mon": "maandag", "tue": "dinsdag", "wed": "woensdag", "thu": "donderdag", "fri": "vrijdag", "sat": "zaterdag", "sun": "zondag"}
+  },
+  "applies": {"restart": {"name": "Geldt na een herstart"}, "now": {"name": "Geldt meteen"}},
+  "home": {
+    "app": {"name": "Batterij-add-on"},
+    "tabs": {"home": "Start", "batteries": "Batterijen", "settings": "Instellingen", "setup": "Installatie", "label": "Schermen"},
+    "now": {"name": "Nu", "description": "Elke 3 seconden bijgewerkt.", "solar": "Zonnepanelen", "house": "Huis", "grid": "Net", "batteries": "Batterijen"},
+    "plan": {
+      "name": "Plan voor vandaag",
+      "description": "Wijs een staaf of blok aan voor details, of tik erop op een telefoon.",
+      "cheap": "Lage prijs",
+      "dear": "Hoge prijs",
+      "estimate": "Schatting",
+      "grid": "Laadt van het net",
+      "give": "Levert stroom",
+      "cycle": "Maandelijkse batterijcyclus",
+      "peak": "Piekgrens",
+      "house": "Volgt het huis",
+      "now": "nu",
+      "time_to": "tot",
+      "per_kwh": "per kWh",
+      "cheap_tip": "laag voor vandaag",
+      "dear_tip": "hoog voor vandaag",
+      "estimate_tip": "schatting op basis van gisteren",
+      "none_tip": "Geen prijs bekend",
+      "no_prices": {"description": "Geen prijzen voor vandaag, dus de grafiek toont alleen het plan."},
+      "list": "Het plan in woorden",
+      "average_tip": "gemiddelde van het uur"
+    },
+    "peak": {"name": "Piekgrens", "this_month": "Piek van deze maand", "limit": "Grens", "none": "Nog niets gemeten", "unreadable": "Nu niet leesbaar"},
+    "attention": {"name": "Vraagt aandacht", "nothing": "Niets om na te kijken", "to_look": "na te kijken", "details": "Details", "alarm": "Alarm", "warning": "Waarschuwing", "info": "Info"},
+    "control": {"name": "Regeling", "stop": "Regeling stoppen", "start": "Regeling starten", "maint_start": "Nu een batterijcyclus starten", "maint_abort": "Batterijcyclus stoppen", "docs": "Documentatie van de add-on", "more": "Meer acties"},
+    "details": {"name": "Details voor installateurs", "rows": "Statusregels", "checks": "Controles", "event": "Laatste gebeurtenis"},
+    "dialog": {
+      "cancel": "Annuleren",
+      "stop": {"name": "Regeling stoppen?", "description": "Elke omvormer gaat naar 0 W tot u de regeling opnieuw start.", "yes": "Regeling stoppen"},
+      "start": {"name": "Regeling starten?", "description": "De add-on regelt de batterijen weer en heft een veiligheidsstop op.", "yes": "Regeling starten"},
+      "maint_start": {"name": "Batterijcyclus starten?", "description": "De batterij loopt leeg, laadt weer op en blijft vol, wat enkele uren duurt.", "yes": "Cyclus starten"},
+      "maint_abort": {"name": "Batterijcyclus stoppen?", "description": "Elke omvormer gaat even naar 0 W, daarna gaat de regeling verder.", "yes": "Cyclus stoppen"}
+    },
+    "toast": {"started": "Regeling gestart.", "stopped": "Regeling gestopt.", "done": "Klaar.", "failed": "Dat lukte niet. Probeer opnieuw."},
+    "offline": {"name": "Add-on niet bereikbaar", "description": "De pagina probeert het elke 3 seconden opnieuw."},
+    "setup_only": {"name": "Installatie: nog niets wordt geregeld", "description": "Er gaat niets naar een omvormer tot de installatie bewaard is en de add-on herstart.", "control": "De regeling start na de installatie.", "open": "Installatie openen"},
+    "batteries": {"name": "Batterijen", "description": "Batterijmodi en aan- en uitschakelaars komen in een latere update.", "level": "Laadniveau", "now": "Nu", "stored": "Opgeslagen", "mode": "Modus", "settings": "Instellingen van omvormers wijzigen"},
+    "settings": {"name": "Instellingen", "description": "De instellingen staan hieronder per taak.", "open": "Instellingen openen"}
+  },
+  "choices_later": {"region": {"wallonia": "Wallonië, nog geen standaardwaarde", "brussels": "Brussel, nog geen standaardwaarde"}},
+  "choice_help": {
+    "meter_source": {
+      "off": {"description": "Een Home Assistant-entiteit met het netvermogen in W, positief als u van het net afneemt."},
+      "ha_dsmr": {"description": "Twee Home Assistant-entiteiten van de DSMR-integratie, een voor afname en een voor injectie."},
+      "mqtt_p1": {"description": "De meetwaarden komen via MQTT binnen op een topic dat u opgeeft."},
+      "ha_signed": {"description": "Eén Home Assistant-entiteit met het nettovermogen, positief bij afname."},
+      "homewizard_local": {"description": "De add-on leest een HomeWizard-meter op uw netwerk en merkt een vastgelopen meter op."}
+    }
+  },
+  "settings": {
+    "name": "Instellingen",
+    "description": "Elke instelling, per taak, en de eenvoudige weergave volgt in een latere update.",
+    "classic": "Klassieke instellingen",
+    "search": {"name": "Instelling zoeken", "description": "Zoek een instelling, bijvoorbeeld piek of meter."},
+    "no_match": {"description": "Geen instelling past bij uw zoekopdracht."},
+    "loading": "Instellingen laden",
+    "load_failed": {"name": "Instellingen niet leesbaar", "description": "De add-on kon zijn bewaarde instellingen niet lezen, dus gebruik Klassieke instellingen of het tabblad Configuratie."},
+    "footer": {"description": "Elke wijziging gaat door de startcontroles van de add-on voor ze bewaard wordt."},
+    "to_fix": "op te lossen",
+    "to_check": "na te kijken",
+    "changed": "gewijzigd",
+    "on": "Aan",
+    "off": "Uit",
+    "not_set": "Niet ingesteld",
+    "locked": "Vergrendeld",
+    "change": "Wijzigen",
+    "support": {"description": "Deze zijn gemeten op echte hardware, dus wijzig ze alleen als support erom vraagt."},
+    "picker": {"choose": "Kies een entiteit", "search": {"description": "Zoek op naam of entiteit-id."}, "all": "Alle entiteiten tonen", "use": "Deze entiteit-id gebruiken", "clear": "Wissen", "missing": "Niet in Home Assistant", "none": {"description": "Niets gevonden, dus kijk de entiteit na in Ontwikkelhulpmiddelen."}},
+    "add_inverter": "Omvormer toevoegen",
+    "inverter": "Omvormer",
+    "remove": "Verwijderen",
+    "add_row": "Regel toevoegen",
+    "add_solar": "Zonne-omvormer toevoegen",
+    "periods": {"window": "Tijdvak", "from": "Van", "to": "Tot", "days": "Dagen", "price": "Prijs", "add": "Tijdvak toevoegen"},
+    "reversed": "Meet negatief",
+    "phase": "Fase",
+    "raw_roster": {"description": "Deze lijst met omvormers kan alleen op het tabblad Configuratie wijzigen."},
+    "region_year": "cijfers van {year}",
+    "hour": "{hour}:00 UTC",
+    "preset": {"description": "Ingevuld door de regio hierboven, dus kies een eigen bedrag om het te wijzigen."},
+    "cycle": {"name": "Een cyclus met de hand starten", "description": "Dezelfde acties als op Start, die elk eerst om bevestiging vragen."},
+    "savebar": {"label": "Niet bewaarde wijzigingen", "one": "wijziging niet bewaard", "many": "wijzigingen niet bewaard", "discard": "Verwerpen", "save": "Bewaren", "saving": "Bewaren"},
+    "saved": {"name": "Bewaard, nog niet actief", "description": "De add-on werkt met de instellingen waarmee hij startte tot u hem herstart."},
+    "differs": {"name": "Bewaarde instellingen zijn niet actief", "description": "Sommige bewaarde instellingen verschillen van wat nu draait, dus herstart de add-on om ze toe te passen."},
+    "stale": {"name": "Elders gewijzigd", "description": "Deze instellingen zijn elders gewijzigd terwijl u bewerkte, dus bewaar opnieuw om de uwe te houden of verwerp om de andere te laden."},
+    "other": "Andere meldingen",
+    "restart": "Nu herstarten",
+    "dialog": {"name": "Add-on herstarten?", "description": "Elke omvormer gaat naar 0 W terwijl de add-on herstart, daarna gelden de nieuwe instellingen.", "yes": "Nu herstarten"},
+    "toast": {"saved": "Bewaard. Herstart om toe te passen.", "discarded": "Wijzigingen verworpen.", "failed": "Dat lukte niet. Probeer opnieuw.", "blocked": {"description": "Los de rood gemarkeerde instellingen op en bewaar opnieuw."}, "restarting": {"description": "Herstart gevraagd, dus deze pagina antwoordt even niet."}},
+    "tier": {"bad": "Oplossen", "warn": "Nakijken", "info": "Opmerking", "ok": "In orde"},
+    "derive": {
+      "raw_roster": {"description": "Deze lijst met omvormers kan alleen op het tabblad Configuratie wijzigen."},
+      "no_inverter": {"description": "Voeg minstens één omvormer toe."},
+      "flat_named": {"description": "Voeg een tweede omvormer toe voor u deze een naam geeft."},
+      "no_source": {"description": "Kies waar de dynamische prijzen vandaan komen."},
+      "custom_profile": {"description": "Deze tijdvakken kunnen alleen op het tabblad Configuratie wijzigen."},
+      "no_price": {"description": "Vul een prijs per kWh in."},
+      "no_periods": {"description": "Voeg minstens één tijdvak toe."},
+      "period_time": {"description": "Tijdvak {row}: schrijf elk tijdstip als uren en minuten, zoals 07:00 of 24:00."},
+      "period_zero": {"description": "Tijdvak {row} begint en eindigt op hetzelfde uur, dus wijzig een van beide."},
+      "period_price": {"description": "Tijdvak {row}: vul een prijs per kWh in."},
+      "period_price_range": {"description": "Tijdvak {row}: vul de prijs in euro per kWh in, zoals 0,34."},
+      "period_overlap": {"description": "Tijdvakken {a} en {b} vallen allebei op {day} {from} tot {to}, dus wijzig er een."},
+      "period_gap": {"description": "Geen tijdvak dekt {day} {from} tot {to}, dus voeg er een toe of maak er een breder."},
+      "unknown": {"description": "De pagina kan deze keuze niet bewaren, dus laad de pagina opnieuw."}
+    },
+    "setup": {
+      "name": "Installatie",
+      "description": "Voor installateurs: zes stappen naar een werkende installatie, en elke stap kan later wijzigen onder Instellingen.",
+      "done_before": {"description": "Deze installatie is al ingesteld, dus een wijziging hier vervangt de bewaarde instellingen."},
+      "step": "Stap {n} van {total}",
+      "back": "Terug",
+      "next": "Volgende",
+      "skip": "Volgende, of overslaan",
+      "finish": "Bewaren en herstarten",
+      "not_now": "Niet nu",
+      "steps": {
+        "1": {"name": "Uw meter", "description": "De add-on stuurt de netmeting naar nul, dus eerst is uw meter nodig."},
+        "2": {"name": "Omvormers en batterijen", "description": "Eén kaart per omvormer met een batterij, met zijn entiteiten in Home Assistant."},
+        "3": {"name": "Zonnepanelen", "description": "Niet verplicht, dus sla deze stap over als de add-on de zonneproductie niet moet bijhouden."},
+        "4": {"name": "Prijzen", "description": "Wat u per kWh betaalt, zodat de batterijen laden als stroom goedkoop is."},
+        "5": {"name": "Piekgrens", "description": "Het net blijft onder deze grens, gemiddeld over elk kwartier."},
+        "6": {"name": "Nakijken en starten", "description": "De add-on kijkt alles na met zijn eigen startcontroles en herstart dan."}
+      },
+      "modes_later": {"description": "Een modus kiezen per batterij komt in een latere update."},
+      "kettle": {
+        "name": "Richting nakijken",
+        "description": "Lees de meter af, zet een waterkoker aan en lees de meter opnieuw af.",
+        "read": "Meter aflezen",
+        "again": "Opnieuw aflezen",
+        "skip": "Deze test overslaan",
+        "before": {"description": "De meter geeft nu {w} aan, dus zet een waterkoker aan en druk op Opnieuw aflezen."},
+        "unread": {"description": "De meter is nu niet leesbaar, dus kijk de entiteit na en probeer opnieuw."},
+        "none": {"description": "De meting veranderde maar {d}, dus zet de waterkoker aan en lees opnieuw af."},
+        "ok": {"description": "Goed, de meting steeg met {d} toen de waterkoker aanging."},
+        "flip": {"description": "De meting daalde met {d}, dus de add-on keert het teken voor u om."},
+        "wrong_signed": {"description": "De meting daalde met {d}, dus kies hierboven “Eén entiteit voor netvermogen”, die het kan omkeren."},
+        "wrong_dsmr": {"description": "De meting daalde met {d}, dus kijk na of afname en injectie niet omgewisseld zijn."},
+        "self": {"description": "De add-on leest deze meter zelf, dus Start toont de richting na de herstart."},
+        "skipped": {"description": "De richting van de meter is niet getest, dus kijk ze na op Start na de herstart."},
+        "skipped_wrong": {"description": "Bij de waterkokertest daalde de meting, dus kijk de richting na in stap 1 voor u de regeling start."},
+        "skipped_down": {"description": "De meting daalde toen de waterkoker aanging, dus kijk de richting van de meter na voor u de regeling start."},
+        "tested": {"description": "De richting van de meter is getest met een waterkoker."},
+        "needed": {"description": "Doe eerst de waterkokertest, of sla hem over."}
+      },
+      "check": {"name": "Wat de add-on nakeek", "running": {"description": "Bezig met de startcontroles van de add-on."}, "pass": {"description": "De startcontroles van de add-on zijn in orde."}, "failed": {"description": "De controle liep niet, dus probeer opnieuw."}, "again": "Opnieuw nakijken", "blocked": {"description": "Los de rood gemarkeerde punten op en kijk dan opnieuw na."}},
+      "shadow": {"name": "Starten in schaduwmodus", "description": "Aanbevolen, want dan blijft elke omvormer op 0 W tot u de schaduwmodus uitzet onder Instellingen."},
+      "dialog": {"name": "Bewaren en herstarten?", "description": "Elke omvormer gaat naar 0 W terwijl de add-on herstart, en de schaduwmodus houdt ze daarna op 0 W.", "yes": "Bewaren en herstarten"},
+      "dialog_live": {"name": "Bewaren en herstarten?", "description": "Elke omvormer gaat naar 0 W terwijl de add-on herstart, daarna gelden de nieuwe instellingen.", "yes": "Bewaren en herstarten"},
+      "dialog_setup": {"name": "Bewaren en herstarten?", "description": "De add-on herstart met deze instellingen, en de schaduwmodus houdt elke omvormer op 0 W.", "yes": "Bewaren en herstarten"},
+      "dialog_setup_live": {"name": "Bewaren en herstarten?", "description": "De add-on herstart met deze instellingen, en dan gelden ze.", "yes": "Bewaren en herstarten"},
+      "done": {"name": "Installatie is klaar", "description": "De add-on herstart nu in schaduwmodus, dus open Start over een minuut om te zien wat hij zou doen."},
+      "done_live": {"name": "Installatie is klaar", "description": "De add-on herstart nu, dus open Start over een minuut om de regeling te starten."},
+      "restart_failed": {"name": "Bewaard, nog niet actief", "description": "De herstart lukte niet, dus druk op Nu herstarten om de instellingen toe te passen."},
+      "home": "Start openen"
+    }
+  },
+  "home_words": {
+    "mode_house": "Volgt het huis",
+    "attn_shadow": "Schaduwmodus staat aan",
+    "attn_shadow_body": "De add-on beslist alles, maar elke omvormer blijft op 0 W.",
+    "zero_held": "Op 0 W gehouden",
+    "zero_going": "Gaat naar 0 W",
+    "verdict": {"held": "Op 0 W gehouden", "stopped": "Gestopt", "cycle": "Vandaag maandelijkse cyclus", "trade": "Handelt op prijs", "house": "Volgt het huis"},
+    "pill": {"running": "Actief", "shadow": "Schaduwmodus", "stopped": "Gestopt", "alarm": "Heeft u nu nodig", "warning": "Actief, met een waarschuwing"},
+    "banner_sub": {"running": "De batterijen volgen het plan hieronder.", "shadow": "De plannen hieronder tonen wat de add-on zou doen.", "stopped": "Start de regeling hieronder als u klaar bent.", "alarm": "Zie Vraagt aandacht hieronder voor wat u moet doen.", "warning": "Zie Vraagt aandacht hieronder."},
+    "tile": {"not_set_up": "Niet ingesteld", "no_reading": "Geen meting", "producing": "Produceert", "not_producing": "Produceert niet", "needs_solar": "Zonnemeting nodig", "not_adding_up": "Metingen kloppen niet samen", "using": "Verbruikt", "taking": "Neemt af van het net", "feeding": "Injecteert", "balanced": "In evenwicht", "giving": "Levert stroom", "charging": "Laadt", "resting": "Rust"},
+    "now": {
+      "no_reading": "Geen meting van deze batterij.",
+      "would_rest": "{zero}. Zou nu rusten.",
+      "would_give": "{zero}. Zou nu {kw} leveren.",
+      "would_charge": "{zero}. Zou nu {kw} laden.",
+      "held": "{zero} tot het alarm weg is.",
+      "stopped": "{zero} zolang de regeling gestopt is.",
+      "cycle_drain": "Maandelijkse cyclus: leegmaken.",
+      "cycle_charge": "Maandelijkse cyclus: opladen.",
+      "cycle_hold": "Maandelijkse cyclus: vol houden.",
+      "cycle": "Maandelijkse cyclus bezig.",
+      "giving": "Levert nu {kw}.",
+      "charging": "Laadt nu {kw}.",
+      "resting": "Rust nu."
+    },
+    "head": {
+      "held": "Elke omvormer staat op 0 W tot het alarm weg is.",
+      "held_going": "Elke omvormer gaat naar 0 W tot het alarm weg is.",
+      "stopped": "De regeling is gestopt, dus er is niets gepland.",
+      "cycle": "Een batterij doet vandaag zijn maandelijkse cyclus.",
+      "trade": "Laadt in het goedkoopste uur, levert stroom in het duurste.",
+      "house": "Laadt met zonne-overschot en dekt het huis.",
+      "shadow": "Schaduwmodus: dit is wat de add-on zou doen.",
+      "cycle_would": "Een batterij zou vandaag zijn maandelijkse cyclus doen.",
+      "trade_would": "Zou laden als het goedkoopst is en leveren als het duurst is.",
+      "house_would": "Zou laden met zonne-overschot en het huis dekken."
+    },
+    "run": {
+      "grid_what": "Laadt tot {kwh} van het net.",
+      "grid_what_would": "Zou tot {kwh} van het net laden.",
+      "grid_why": "Laagste gepubliceerde prijs, {eur} per kWh.",
+      "grid_amount": "Kost tot {eur}.",
+      "give_what": "Levert tot {kwh}, eerst aan het huis.",
+      "give_what_would": "Zou tot {kwh} leveren, eerst aan het huis.",
+      "give_why": "Hoogste gepubliceerde prijs, {eur} per kWh.",
+      "give_amount": "Tot {eur} waard aan die prijs.",
+      "cycle_start": "Start de maandelijkse batterijcyclus.",
+      "cycle_start_would": "Zou de maandelijkse batterijcyclus starten.",
+      "cycle_now": "Doet nu de maandelijkse batterijcyclus.",
+      "cycle_now_would": "Zou nu de maandelijkse batterijcyclus doen.",
+      "cycle_why": "Maakt leeg, laadt op en houdt vol, zodat het laadniveau klopt.",
+      "cycle_why_would": "Zou leegmaken, opladen en vol houden, zodat het laadniveau klopt.",
+      "cycle_amount_unknown": "Hoe lang hangt af van de batterij.",
+      "cycle_amount": "Duurt ongeveer {hours} uur.",
+      "peak_what": "Levert stroom om onder {kw} te blijven.",
+      "peak_what_would": "Zou stroom leveren om onder {kw} te blijven.",
+      "peak_why": "De piekgrens gaat voor alles.",
+      "house_what": "Volgt het huis.",
+      "house_what_would": "Zou het huis volgen.",
+      "house_why": "Laadt met zonne-overschot, levert als het huis vraagt.",
+      "house_why_would": "Zou laden met zonne-overschot, leveren als het huis vraagt.",
+      "house_amount": "Hoeveel hangt af van de zon en het huis."
+    },
+    "no_trade": {
+      "not_covered": "Geen handel op prijs: niets meet de kwartierpiek.",
+      "no_prices": "Nog geen handel op prijs: er zijn geen prijzen binnen.",
+      "peak": "Nu geen handel op prijs: de piekgrens gaat voor.",
+      "not_firm": "Nog geen handel op prijs: de prijzen zijn niet gepubliceerd.",
+      "not_worth": "Vandaag geen handel op prijs. Het prijsverschil is te klein.",
+      "no_level": "Nu geen handel op prijs: een laadniveau is onbekend."
+    },
+    "tomorrow_trade": {"grid": "Morgen: laadt om {at}, {eur} per kWh.", "grid_would": "Morgen: zou laden om {at}, {eur} per kWh.", "give": "Morgen: levert stroom om {at}, {eur} per kWh.", "give_would": "Morgen: zou stroom leveren om {at}, {eur} per kWh."},
+    "cycle_waits": "{name} wacht zijn beurt af voor de maandelijkse cyclus.",
+    "step_in": "De batterijen springen bij boven {kw}.",
+    "step_in_would": "De batterijen zouden bijspringen boven {kw}.",
+    "period": "Dit kwartier gaat richting {kw}.",
+    "prices": {"now": "Prijs nu {eur} per kWh, alles inbegrepen.", "today": "Vandaag: laagste {lo} om {lo_at}, hoogste {hi} om {hi_at}.", "none": "Geen prijzen voor vandaag."},
+    "tomorrow": {"known": "De prijzen van morgen zijn binnen.", "unknown": "De prijzen van morgen komen meestal na 13:00."},
+    "region": {"preset": "Heffingen en btw: {region}, cijfers van {year}.", "own": "Heffingen en btw: uw eigen bedrag."},
+    "peak_not_covered": "Geen piekgrens: deze meter meet geen kwartieren.",
+    "control": {"shadow": "Schaduwmodus: elke omvormer blijft op 0 W.", "running": "De regeling is actief.", "stopped": "De regeling is gestopt. Elke omvormer staat op 0 W."},
+    "attn": {
+      "controller": "Regeling is niet actief",
+      "meter": "Meting van de meter",
+      "meter_frozen": "Meter staat mogelijk vast",
+      "freeze_check": "Controle op vastgelopen meter",
+      "month_peak": "Piek van deze maand",
+      "peak_guard": "Piekgrens",
+      "peak_forecast": "Prognose voor de piekgrens",
+      "sensor": "Metingen van de batterij",
+      "control": "Regeling van de omvormer",
+      "power_too_high": "Vermogensvraag te hoog",
+      "not_keeping_up": "Batterij kan niet volgen",
+      "write": "Vermogensvraag niet aanvaard",
+      "direction": "Vermogen de verkeerde kant op",
+      "site_direction": "Vermogen de verkeerde kant op",
+      "circulating": "Omvormers werken elkaar tegen",
+      "delivery": "Een omvormer levert niet",
+      "estop": "Noodstop",
+      "pv": "Meting van de zonnepanelen",
+      "none": "Verbinding met de omvormer"
+    },
+    "months": ["januari", "februari", "maart", "april", "mei", "juni", "juli", "augustus", "september", "oktober", "november", "december"]
+  }
+}

goodwe_controller/app/uilayout.py

@@ -23,8 +23,9 @@ CHOICE, ENTITY, ENTITY_LIST, TOGGLE, SEGMENTED, SLIDER = (
     "choice", "entity", "entity_list", "toggle", "segmented", "slider")
 NUMBER, TEXT, SELECT, LOCKED, INVERTER_LIST, SOLAR_LIST = (
     "number", "text", "select", "locked", "inverter_list", "solar_list")
+PERIOD_LIST = "period_list"     # P5: time windows, each with its own price
 CONTROLS = (CHOICE, ENTITY, ENTITY_LIST, TOGGLE, SEGMENTED, SLIDER, NUMBER,
-            TEXT, SELECT, LOCKED, INVERTER_LIST, SOLAR_LIST)
+            TEXT, SELECT, LOCKED, INVERTER_LIST, SOLAR_LIST, PERIOD_LIST)
 # What an entity picker offers first. `power_w` is a power sensor the add-on
 # reads as watts with no unit conversion, so validate.py warns on a kW sensor.
 ENTITY_KINDS = ("power_w", "power", "energy", "pct", "number", "any")
@@ -154,6 +155,8 @@ GROUPS = (
                   show=(("ui.fallback", "==", "daynight"),), wizard=4),
             Field("ui.night_price", NUMBER, "€/kWh", step=0.01,
                   show=(("ui.fallback", "==", "daynight"),), wizard=4),
+            Field("ui.periods", PERIOD_LIST, "€/kWh", step=0.01,
+                  show=(("ui.fallback", "==", "custom"),), wizard=4),
         )),
         Part("selling", (
             # OPT-11: derived from the batteries' selling switches once battery

goodwe_controller/app/uimodel.py

@@ -2,8 +2,8 @@
 
 `options_to_ui()` turns the stored blob into what the page edits: always a list
 of inverter cards, solar rows with a "reads negative" toggle, a contract and
-simple prices instead of `static_profile` JSON, and a region preset instead of
-the levies figure. `ui_to_options()` turns it back, so the validator and the
+simple prices or time windows (P5) instead of `static_profile` JSON, and a
+region preset instead of the levies figure. `ui_to_options()` turns it back, so the validator and the
 Supervisor always see the real blob.
 
 The rule that makes the round trip exact: the model carries the stored values
@@ -16,12 +16,14 @@ See DECISIONS/UX-13-one-layout-table.md.
 
 import copy
 import json
+import re
 
-from .price import FLEMISH_TAXES_COMPONENTS_EUR_KWH
-from .static_tariff import ProfileInvalid, parse_static_profile
+from .price import FLEMISH_TAXES_COMPONENTS_EUR_KWH, MAX_PLAUSIBLE_EUR_KWH
+from .static_tariff import (DAY_NAMES, MINUTES_PER_DAY, Period, ProfileInvalid,
+                            parse_static_profile)
 
 __all__ = ["options_to_ui", "ui_to_options", "ui_to_options_partial",
-           "REGION_PRESETS",
+           "REGION_PRESETS", "PERIOD_DAYS",
            "arbitrage_from_batteries", "DeriveError", "COUNT", "GROWN"]
 
 
@@ -30,9 +32,10 @@ class DeriveError(ValueError):
     the sentence the page shows (app/ui_text `derive.<code>`), and `field` the
     page field it is shown beside."""
 
-    def __init__(self, text, code="", field=""):
+    def __init__(self, text, code="", field="", **values):
         super().__init__(text)
         self.code, self.field = code, field
+        self.values = values    # the sentence's {placeholders} (P5)
         self.keys = ()          # the option keys the failed derivation writes
 
 
@@ -213,14 +216,125 @@ def _profile_decode(raw):
     return "custom", None, None, None
 
 
+# --- 3b. the time-window editor (UX-13 P5) ---------------------------------- #
+# Each row is {"from", "to", "days", "price"} and, when read from a stored
+# profile, its "name". `days` is one of these; a profile with any other day set
+# is edited in the Configuration tab only (`ui.periods` is None).
+PERIOD_DAYS = ("mon-sun", "mon-fri", "sat,sun") + DAY_NAMES
+_DAYSETS = {d: frozenset(range(7)) if d == "mon-sun" else
+            frozenset(range(5)) if d == "mon-fri" else
+            frozenset((5, 6)) if d == "sat,sun" else
+            frozenset((DAY_NAMES.index(d),)) for d in PERIOD_DAYS}
+_TIME = re.compile(r"^\s*(\d{1,2}):(\d{2})\s*$")
+
+
+def _hhmm(minute) -> str:
+    return f"{minute // 60:02d}:{minute % 60:02d}"
+
+
+def _periods_decode(raw):
+    """The rows for a stored profile: [] when unset, None when it cannot be
+    shown as rows (unparsable, or days the editor has no choice for)."""
+    try:
+        prof = parse_static_profile(raw) if isinstance(raw, str) else None
+    except ProfileInvalid:
+        return None
+    if prof is None:
+        return [] if isinstance(raw, str) else None
+    rows = []
+    for p in prof.periods:
+        days = next((d for d, s in _DAYSETS.items() if s == p.days), None)
+        if days is None:
+            return None
+        rows.append({"from": _hhmm(p.start_min), "to": _hhmm(p.end_min),
+                     "days": days, "price": p.eur_per_kwh, "name": p.name})
+    return rows
+
+
+def _minute(text, *, end):
+    """"07:00" -> 420, "24:00" -> 1440 as an end, else None."""
+    m = _TIME.match(str(text or ""))
+    if not m:
+        return None
+    h, mi = int(m.group(1)), int(m.group(2))
+    if mi > 59 or h > 24 or (h == 24 and (mi or not end)):
+        return None
+    return h * 60 + mi
+
+
+def _periods_json(rows) -> str:
+    """The static_profile for the editor's rows, or DeriveError naming the
+    first problem: a bad time, an empty price, an overlap or a gap."""
+    if not rows:
+        raise DeriveError("add at least one time window", "no_periods",
+                          "ui.periods")
+    periods = []
+    for i, row in enumerate(rows, start=1):
+        row = row if isinstance(row, dict) else {}
+        start = _minute(row.get("from"), end=False)
+        end = _minute(row.get("to"), end=True)
+        if start is None or end is None:
+            raise DeriveError(f"window {i} has a bad time", "period_time",
+                              "ui.periods", row=i)
+        end = end or MINUTES_PER_DAY            # "00:00" as an end
+        if start == end:
+            raise DeriveError(f"window {i} is empty", "period_zero",
+                              "ui.periods", row=i)
+        price = _num(row.get("price"))
+        if price is None:
+            raise DeriveError(f"window {i} needs a price", "period_price",
+                              "ui.periods", row=i)
+        if abs(price) > MAX_PLAUSIBLE_EUR_KWH:
+            raise DeriveError(f"window {i}'s price is out of range",
+                              "period_price_range", "ui.periods", row=i)
+        if row.get("days") not in _DAYSETS:
+            raise DeriveError(f"window {i} has no days", "unknown",
+                              "ui.periods")
+        name = str(row.get("name") or "").strip() or f"window{i}"
+        periods.append(Period(name=name, start_min=start, end_min=end,
+                              days=_DAYSETS[row["days"]],
+                              eur_per_kwh=price))
+    _tiling(periods)
+    return json.dumps({"periods": [
+        {"name": p.name, "from": _hhmm(p.start_min),
+         "to": _hhmm(p.end_min), "days": row["days"],
+         "eur_per_kwh": p.eur_per_kwh}
+        for p, row in zip(periods, rows)]})
+
+
+def _tiling(periods):
+    """Each minute of the week in exactly one window, as static_tariff.py
+    requires. The first overlap or gap, by day and time, is the error."""
+    for day in range(7):
+        start, kind, rows = None, None, None
+        for minute in range(MINUTES_PER_DAY + 1):
+            here = [i for i, p in enumerate(periods, start=1)
+                    if minute < MINUTES_PER_DAY and p.covers(day, minute)]
+            now = ("gap" if not here else "overlap" if len(here) > 1
+                   else None) if minute < MINUTES_PER_DAY else "end"
+            if kind is not None and (now != kind or (kind == "overlap"
+                                                     and here != rows)):
+                values = {"day": DAY_NAMES[day], "from": _hhmm(start),
+                          "to": _hhmm(minute)}
+                if kind == "gap":
+                    raise DeriveError("a time has no window", "period_gap",
+                                      "ui.periods", **values)
+                raise DeriveError("two windows cover one time",
+                                  "period_overlap", "ui.periods",
+                                  a=rows[0], b=rows[1], **values)
+            if now in ("gap", "overlap") and kind is None:
+                start, kind, rows = minute, now, here
+
+
 def _tariff_decode(o):
-    kind, fixed, day, night = _profile_decode(o.get("static_profile", ""))
+    raw = o.get("static_profile", "")
+    kind, fixed, day, night = _profile_decode(raw)
     provider = o.get("price_provider")
     dynamic = not _blank(provider) and provider != "off"
     return {"ui.contract": "dynamic" if dynamic else kind,
             "price_provider": provider, "ui.fallback": kind,
             "ui.fixed_price": fixed, "ui.day_price": day,
-            "ui.night_price": night}
+            "ui.night_price": night, "ui.periods": _periods_decode(raw)}
 
 
 def _tariff_encode(m, keep):
@@ -243,10 +357,15 @@ def _tariff_encode(m, keep):
         out["static_profile"] = _daynight_json(_price_of(m, "ui.day_price"),
                                                _price_of(m, "ui.night_price"))
     elif kind == "custom":
-        if "static_profile" not in keep:
+        rows = m.get("ui.periods")
+        if rows is not None:
+            out["static_profile"] = _periods_json(rows)
+        elif "static_profile" not in keep:
             raise DeriveError("odd tariff windows are edited in the "
                               "Configuration tab", "custom_profile",
                               "ui.contract")
+        else:
+            # Days the editor cannot show: kept as stored.
             out["static_profile"] = keep["static_profile"]
     else:
         raise DeriveError(f"unknown contract {kind!r}", "unknown",

goodwe_controller/app/uipage.py

@@ -9,26 +9,23 @@ are (DECISIONS/UX-13-one-layout-table.md).
 """
 
 import copy
-import io
-import json
 import os
 import re
 
 from . import uilayout as L
+from . import uitext
 from . import uimodel as U
 from .configui import help_of, label_of, problems_by_field, split_group
 from .validate import power_request_entities
 
-UI_TEXT = os.path.join(os.path.dirname(os.path.abspath(__file__)), "ui_text",
-                       "en.json")
-# A choice the page cannot make, only keep: odd tariff windows (P5 editor).
-ONLY_IF_HELD = ("custom",)
+# A choice the page cannot make, only keep. None since P5's period editor.
+ONLY_IF_HELD = ()
 _TIERS = ("bad", "warn", "info")
 
 
-def ui_text() -> dict:
-    with io.open(UI_TEXT, encoding="utf-8") as f:
-        return json.load(f)
+def ui_text(lang="en") -> dict:
+    """The page words in `lang`, English where Dutch has no key (P5)."""
+    return copy.deepcopy(uitext.words(lang))
 
 
 def _roster():
@@ -122,6 +119,10 @@ def _field(fld, schema_ui, translations, lang, T):
         if hints:
             out["hints"] = {v: e.get("description", "")
                             for v, e in hints.items()}
+    if fld.control == L.PERIOD_LIST:
+        # P5: the day choices of one time window, in the editor's order.
+        names = T["choices"]["period_days"]
+        out["days"] = [[d, names.get(d, d)] for d in U.PERIOD_DAYS]
     if fld.mirror:
         out["mirror"] = fld.mirror
     if fld.fills:
@@ -145,7 +146,7 @@ def _field(fld, schema_ui, translations, lang, T):
 def layout(schema_ui, translations, lang="en") -> dict:
     """Every group, part and field of the Installer view, as the page draws
     it. Built from the table only: a field the table places is on the page."""
-    T = ui_text()
+    T = ui_text(lang)
     groups = []
     for g in L.GROUPS:
         parts = []
@@ -220,14 +221,19 @@ def _settle(out: dict, stored: dict | None) -> dict:
             | {k: v for k, v in out.items() if k not in stored})
 
 
-def derive_message(err: U.DeriveError) -> dict:
-    words = ui_text()["settings"]["derive"]
+def derive_message(err: U.DeriveError, lang="en") -> dict:
+    T = uitext.words(lang)
+    words = T["settings"]["derive"]
     text = words.get(err.code, words["unknown"])["description"]
+    args = dict(getattr(err, "values", None) or {})
+    # A time window's day is shown by name (P5 period editor).
+    if "day" in args:
+        args["day"] = T["choices"]["period_days"].get(args["day"], args["day"])
     return {"field": err.field or None, "card": None, "tier": "bad",
-            "text": text}
+            "text": uitext.say(text, **args)}
 
 
-def derive_messages(errors, problems, notes, model, keys):
+def derive_messages(errors, problems, notes, model, keys, lang="en"):
     """The page's messages when part of the model could not become options:
     each conversion's own sentence beside its field, then the checks of the
     rest. A refusal or note about a key the failed conversion writes is left
@@ -238,7 +244,7 @@ def derive_messages(errors, problems, notes, model, keys):
             for t in texts] + list(unanchored)
     kept = [p for p in problems if p in kept]
     notes = [n for n in notes if not set(n.keys or ()) & failed]
-    return ([derive_message(err) for err in errors]
+    return ([derive_message(err, lang) for err in errors]
             + anchors(kept, notes, model, keys))
 
 

goodwe_controller/app/uitext.py

@@ -0,0 +1,51 @@
+"""UX-13 P5: the page's words, app/ui_text/<lang>.json, in English or Dutch.
+
+One file per language with the same keys. A key missing from a language falls
+back to English, key by key, the way the Supervisor's translations do.
+test_ui_text.py holds both files to STYLE.md and to each other.
+"""
+
+import copy
+import io
+import json
+import os
+
+DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), "ui_text")
+LANGS = ("en", "nl")
+_CACHE: dict = {}
+
+
+def lang_of(value) -> str:
+    """"nl", "nl-BE" or "nl_NL" -> "nl"; anything else -> "en"."""
+    head = str(value or "").strip().lower().replace("_", "-").split("-")[0]
+    return head if head in LANGS else "en"
+
+
+def raw(lang: str) -> dict:
+    """One language file as written, without the English fallback."""
+    if lang not in _CACHE:
+        with io.open(os.path.join(DIR, f"{lang}.json"), encoding="utf-8") as f:
+            _CACHE[lang] = json.load(f)
+    return _CACHE[lang]
+
+
+def _merge(base, over):
+    if not (isinstance(base, dict) and isinstance(over, dict)):
+        return copy.deepcopy(over)
+    out = copy.deepcopy(base)
+    for k, v in over.items():
+        out[k] = _merge(base.get(k), v) if k in base else copy.deepcopy(v)
+    return out
+
+
+def words(lang="en") -> dict:
+    """Every word in `lang`, English where a key is missing."""
+    lang = lang_of(lang)
+    return raw("en") if lang == "en" else _merge(raw("en"), raw(lang))
+
+
+def say(template: str, **values) -> str:
+    """Fill `{name}` placeholders, as settings.js `say()` does."""
+    for k, v in values.items():
+        template = template.replace("{" + k + "}", str(v))
+    return template

goodwe_controller/app/web.py

@@ -43,7 +43,7 @@ from datetime import datetime, timezone
 
 from aiohttp import web
 
-from . import messages, selfconfig, uipage
+from . import messages, selfconfig, uipage, uitext
 from .haentities import EntityCache
 from .homeview import region_of
 from .validate import config_notes, setup_checks
@@ -54,13 +54,12 @@ from .uimodel import DeriveError, options_to_ui
 _LOG = logging.getLogger("goodwe.web")
 
 # UX-13 P1: the page lives in app/static/ as three files - index.html,
-# app.css, app.js - plus the page words from app/ui_text/en.json. They are
+# app.css, app.js - plus the page words from app/ui_text/<lang>.json (English
+# and, since P5, Dutch; the page picks by the browser's language). They are
 # joined into ONE response here, once, so the page needs no second request
 # and no route of its own: the route list below is unchanged, and every URL
 # the page uses stays relative (ingress). No build step, no external file.
 STATIC = os.path.join(os.path.dirname(os.path.abspath(__file__)), "static")
-UI_TEXT = os.path.join(os.path.dirname(os.path.abspath(__file__)), "ui_text",
-                       "en.json")
 
 
 def _read(path):
@@ -71,7 +70,8 @@ def _read(path):
 def page() -> str:
     """The assembled index page. `</` is escaped inside the two inline
     scripts, so no text in them can close the tag early."""
-    ui_text = json.dumps(json.loads(_read(UI_TEXT)), ensure_ascii=False)
+    ui_text = json.dumps({lang: uitext.raw(lang) for lang in uitext.LANGS},
+                         ensure_ascii=False)
     scripts = {}
     for name in ("app.js", "settings.js"):
         scripts[name] = _read(os.path.join(STATIC, name))
@@ -129,8 +129,12 @@ def build_app(controller, selfcfg=None) -> web.Application:
     async def index(_request):
         return web.Response(text=index_page, content_type="text/html")
 
-    async def status(_request):
+    async def status(request):
+        # UX-13 P5: Home's sentences in the page's language, English or Dutch.
+        lang = uitext.lang_of(request.query.get("lang"))
+        if lang == "en":
             return web.json_response(controller.status_payload())
+        return web.json_response(controller.status_payload(lang=lang))
 
     async def action(request):
         try:
@@ -264,7 +268,9 @@ def build_app(controller, selfcfg=None) -> web.Application:
         if model is not None:
             payload["messages"] = (
                 uipage.derive_messages(errors, problems, notes, model,
-                                       _keys_of(options)) if errors
+                                       _keys_of(options),
+                                       uitext.lang_of(_body.get("lang")))
+                if errors
                 else uipage.anchors(problems, notes, model, _keys_of(options)))
             payload["steps"] = uipage.step_problems(payload["messages"], model)
         if _body.get("setup"):
@@ -316,7 +322,8 @@ def build_app(controller, selfcfg=None) -> web.Application:
         except DeriveError:
             model = posted["model"]
             _opts, errors = uipage.to_options_partial(model, stored_now)
-            messages_ = [uipage.derive_message(e) for e in errors]
+            lang = uitext.lang_of(posted.get("lang"))
+            messages_ = [uipage.derive_message(e, lang) for e in errors]
             return web.json_response(
                 {"kind": "invalid", "problems": [], "by_key": {},
                  "unanchored": [], "messages": messages_,

goodwe_controller/test_home.py

@@ -546,12 +546,13 @@ def resolve(path):
     return node
 
 
-check("the page is assembled: no placeholder is left and the words parse",
+_WORDS = json.loads(PAGE.split('id="ui-text">', 1)[1]
+                    .split("</script>", 1)[0].replace("<\\/", "</"))
+check("the page is assembled: no placeholder is left and the words parse, "
+      "English and Dutch (UX-13 P5)",
       "/*APP_CSS*/" not in PAGE and "/*APP_JS*/" not in PAGE
       and "/*UI_TEXT*/" not in PAGE
-      and json.loads(PAGE.split('id="ui-text">', 1)[1]
-                     .split("</script>", 1)[0].replace("<\\/", "</"))["home"]
-      == UI)
+      and _WORDS["en"]["home"] == UI and set(_WORDS) == {"en", "nl"})
 check("four tabs with the four hash routes, in a keyboard tablist",
       re.findall(r'data-hash="(\w+)"', PAGE) == ["home", "batteries",
                                                  "settings", "setup"]
@@ -563,7 +564,7 @@ check(f"no external file and no web font: no URL leaves the add-on "
       and "<link" not in PAGE and "src=" not in PAGE)
 _abs = re.findall(r"""(?:fetch\(|href=)["'](/[^"']*)["']""", PAGE)
 check(f"every fetch and link is relative, for ingress ({_abs})",
-      not _abs and 'fetch("status"' in JS and 'fetch("action"' in JS)
+      not _abs and 'fetch("status?lang=' in JS and 'fetch("action"' in JS)
 _keys = set(re.findall(r'data-t(?:-label)?="([\w.]+)"', PAGE)) | set(
     re.findall(r'''\bt\("([\w.]+)"\)''', JS))
 _missing = sorted(k for k in _keys if not isinstance(resolve(k), str))
@@ -610,6 +611,8 @@ async def _serve():
                 out["page"] = (r.status, r.content_type, await r.text())
             async with s.get(f"http://127.0.0.1:{port}/status") as r:
                 out["status"] = await r.json()
+            async with s.get(f"http://127.0.0.1:{port}/status?lang=nl-BE") as r:
+                out["status_nl"] = await r.json()
             async with s.get(f"http://127.0.0.1:{port}/config/model") as r:
                 out["model"] = await r.json()
     finally:
@@ -618,6 +621,14 @@ async def _serve():
 
 
 E = asyncio.run(_serve())
+_nl_words = json.load(io.open(os.path.join(HERE, "app", "ui_text", "nl.json"),
+                              encoding="utf-8"))["home_words"]
+check("UX-13 P5: /status?lang=nl-BE builds Home in Dutch, and plain /status "
+      "stays English",
+      E["status_nl"]["state"]["pill"] in _nl_words["pill"].values()
+      and E["status_nl"]["control"]["text"] in _nl_words["control"].values()
+      and E["status"]["state"]["pill"] not in _nl_words["pill"].values()
+      and set(E["status_nl"]) == set(E["status"]))
 check("GET / serves the assembled page as HTML", E["page"][0] == 200
       and E["page"][1] == "text/html" and E["page"][2] == PAGE)
 check("GET status over HTTP carries both halves",

goodwe_controller/test_messages.py

@@ -47,57 +47,10 @@ def check(name, cond):
         fails.append(name)
 
 
-# --- the rule (STYLE.md sections 1 and 4) --------------------------------------
-BANNED = re.compile(
-    r"\b(?:(?:SAFETY|TARIFF|TEL|CFG|FCST|OPT|UX|HW|FW|WITNESS|PKG|ARCH)-\d+|"
-    r"integrator|anti-?windup|windup|clamp(?:ed|s)?|i_clamped|saturat\w*|"
-    r"BUG SIGNAL|latch(?:ed)?|arbiter|allocator|registers?|0x[0-9A-Fa-f]+|"
-    r"layer [123]|heartbeat|watchdog|telegrams?|ACKs?|CRC|OTA|Modbus|planner|"
-    r"capaciteitstarief|journalctl|ssh|grep|"
-    r"\d+\.\d+\.\d+\.\d+|[\w-]+\.(?:py|md|yaml|json|db))\b|§\s?\d", re.I)
-ENTITY = re.compile(r"\b(?:sensor|number|binary_sensor|input_\w+|switch|select)"
-                    r"\.[a-z0-9_*]+")
-SNAKE = re.compile(r"\b[a-z0-9]+(?:_[a-z0-9]+)+\b")
-SHOUT = re.compile(r"\b[A-Z]{2,}[A-Z0-9]*(?:[\s-]+[A-Z]{2,}[A-Z0-9]*)+\b")
-PLACEHOLDER = re.compile(r"\{[^{}]*\}|%[-+ #0-9.]*[sdrfgx%]")
-
-
-def words(text):
-    return [w for w in re.findall(r"\S+", PLACEHOLDER.sub("X", text))
-            if re.search(r"[A-Za-z0-9]", w)]
-
-
-def sentences(text):
-    """Sentence count: a stop followed by a space and a capital, or the end."""
-    t = PLACEHOLDER.sub("X", text.strip())
-    t = re.sub(r"\b(e\.g|i\.e|etc)\.", "eg", t)
-    return len([s for s in re.split(r"[.!?](?:\s+|$)", t) if s.strip()])
-
-
-def title_problems(title):
-    out = []
-    if len(words(title)) > 5:
-        out.append(f"title over 5 words ({len(words(title))})")
-    if title.lower().startswith("goodwe"):
-        out.append("title carries a GoodWe prefix")
-    if title.rstrip().endswith("."):
-        out.append("title ends in a full stop")
-    return out + text_problems(title, keys=False, entities=False)
-
-
-def text_problems(text, *, keys, entities):
-    t = PLACEHOLDER.sub("X", text)
-    out = []
-    hit = sorted({m.group(0) for m in BANNED.finditer(t)})
-    if hit:
-        out.append("banned: " + ", ".join(hit[:4]))
-    if not entities and ENTITY.search(t):
-        out.append("entity id: " + ENTITY.search(t).group(0))
-    if not keys and SNAKE.search(ENTITY.sub("", t)):
-        out.append("option key: " + SNAKE.search(ENTITY.sub("", t)).group(0))
-    if SHOUT.search(t):
-        out.append("capitals: " + SHOUT.search(t).group(0))
-    return out
+# --- the rule (STYLE.md sections 1 and 4): tools/style_rules.py, shared with
+# test_ui_text.py since UX-13 P5.
+from style_rules import (BANNED, ENTITY, PLACEHOLDER, SHOUT, SNAKE,  # noqa: E402,F401
+                         sentences, text_problems, title_problems, words)
 
 
 def body_problems(body, severity):
@@ -483,10 +436,13 @@ def collect():
                 if isinstance(v.get("fields"), dict):
                     walk(v["fields"], f"{path}{key}.")
         walk(tr.get("configuration"), "")
-    # UX-13: the new page's own words, held to the option texts' rule.
+    # UX-13: the new page's own words, held to the option texts' rule. Home's
+    # sentences (`home_words`) are templates, checked rendered in part 8.
     for f in sorted((APP / "ui_text").glob("*.json")):
         def walk_ui(node, path):
             for key, v in node.items():
+                if not path and key == "home_words":
+                    continue
                 if isinstance(v, dict):
                     walk_ui(v, f"{path}{key}.")
                 elif isinstance(v, str):
@@ -1852,12 +1808,15 @@ def home_problems(kind, text):
     return out
 
 
-_home = homeview.text_samples()
-_home_bad = [(k, t, p) for k, t in _home for p in [home_problems(k, t)] if p]
-for k, t, p in _home_bad:
-    print(f"    {k}: {t!r}: {p}")
-check(f"every Home sentence obeys its STYLE limit ({len(_home)} rendered, "
-      f"{len(_home_bad)} over)", len(_home) > 80 and not _home_bad)
+for _lang in ("en", "nl"):         # UX-13 P5: Home in English and Dutch
+    _home = homeview.text_samples(_lang)
+    _home_bad = [(k, t, p) for k, t in _home for p in [home_problems(k, t)]
+                 if p]
+    for k, t, p in _home_bad:
+        print(f"    {_lang} {k}: {t!r}: {p}")
+    check(f"every Home sentence in {_lang} obeys its STYLE limit "
+          f"({len(_home)} rendered, {len(_home_bad)} over)",
+          len(_home) > 80 and not _home_bad)
 _shadowed = [t for k, t in homeview.text_samples() if "ould" in t]
 check("in shadow mode the Home plan says what the add-on WOULD do: every "
       "shadow variant of a plan text carries 'would'",

goodwe_controller/test_setup.py

@@ -631,6 +631,12 @@ print(f"    {len(_all)} blobs from {len(B.starts())} starts; "
 check(f"every plan from a new install is accepted by the shipped validator "
       f"({len(_new)} plans)", len(_new) >= 25 and not [n for n, r in _new
                                                      if r])
+_windows = [(n, b) for n, b, r in _all if "periods" in n and not r]
+check(f"UX-13 P5: the time-window plans are among them and write the "
+      f"windows as typed ({len(_windows)} blobs)",
+      len(_windows) >= 12 and all(
+          len(json.loads(b["static_profile"])["periods"]) in (1, 2, 5)
+          for _n, b in _windows))
 _empty = [(n, r) for n, _b, r in _all if n.startswith("empty-")]
 check(f"every plan from a new install as shipped (no power request entity, "
       f"setup-only mode) is accepted ({len(_empty)} plans)",

goodwe_controller/test_ui_text.py

@@ -0,0 +1,252 @@
+"""UX-13 P5: the page's words, English and Dutch, follow STYLE.md.   `python3 test_ui_text.py`
+
+app/ui_text/en.json and nl.json hold every word the Home, Batteries, Settings
+and Setup screens show that is not an option label (those are
+translations/*.yaml, test_translations.py) or a status row (app/messages.py,
+test_messages.py). This check fails CI and names the offending string when:
+
+1. the two files differ in keys, or a string's {placeholders} differ;
+2. a string breaks STYLE.md: a name or label over 6 words, a description over
+   1 sentence of 25 words, any other line over 2 sentences, a semicolon, a
+   banned or jargon word (English and Dutch lists), an option key or entity id;
+3. a string carries its own details (a link, a section number, a file name)
+   instead of leaving them to the page's DOCS link;
+4. Home's sentences, rendered by app/homeview.py in each language, break
+   the Home rules of test_messages.py part 8 (checked there too);
+5. a Dutch string is left in English, outside the short list of words that
+   are the same in both;
+6. the English words that mirror app/messages.py drift from it.
+Each rule is shown to catch a spoiled input (habit 1 of MUTATION.md).
+"""
+
+import json
+import os
+import re
+import sys
+
+HERE = os.path.dirname(os.path.abspath(__file__))
+sys.path.insert(0, os.path.join(HERE, "tools"))
+
+from style_rules import (PLACEHOLDER, sentences, text_problems,   # noqa: E402
+                         title_problems, words)
+from app import homeview, messages, uitext                        # noqa: E402
+
+fails = []
+
+
+def check(name, cond):
+    print(f"  {'ok  ' if cond else 'FAIL'} {name}")
+    if not cond:
+        fails.append(name)
+
+
+def load(lang):
+    with open(os.path.join(HERE, "app", "ui_text", f"{lang}.json"),
+              encoding="utf-8") as f:
+        return json.load(f)
+
+
+EN, NL = load("en"), load("nl")
+
+
+def leaves(node, path=()):
+    """(path, text) for every string, lists included (the month names)."""
+    if isinstance(node, dict):
+        for k, v in node.items():
+            yield from leaves(v, path + (k,))
+    elif isinstance(node, list):
+        for i, v in enumerate(node):
+            yield from leaves(v, path + (i,))
+    else:
+        yield path, node
+
+
+def where(lang, path):
+    return f"{lang}.json:" + ".".join(str(p) for p in path)
+
+
+# ============================================================================ #
+print("1. English and Dutch have the same keys and placeholders")
+_en, _nl = dict(leaves(EN)), dict(leaves(NL))
+_only_en = sorted(where("en", p) for p in _en if p not in _nl)
+_only_nl = sorted(where("nl", p) for p in _nl if p not in _en)
+for x in _only_en + _only_nl:
+    print(f"       MISSING in the other language: {x}")
+check(f"every one of the {len(_en)} English strings has a Dutch one, and no "
+      "Dutch string is extra", not _only_en and not _only_nl and len(_en) > 300)
+_holes = sorted(
+    f"{where('nl', p)}: {sorted(PLACEHOLDER.findall(str(_en[p])))} vs "
+    f"{sorted(PLACEHOLDER.findall(str(t)))}"
+    for p, t in _nl.items() if p in _en
+    and sorted(PLACEHOLDER.findall(str(t)))
+    != sorted(PLACEHOLDER.findall(str(_en[p]))))
+for x in _holes:
+    print(f"       PLACEHOLDERS differ: {x}")
+check("every Dutch string fills the same {placeholders} as its English one",
+      not _holes)
+
+
+# ============================================================================ #
+print("\n2. every string follows STYLE.md, in both languages")
+# STYLE.md section 4, the "Not" column, plus the Dutch words for the same
+# things (translations/nl.yaml keeps "setpoint" in two option names, which the
+# page never shows). Matched as whole words, case-insensitive.
+JARGON = {
+    "en": r"controllers?|control loop|setpoints?|SoC|state of charge|BMS|PV|"
+          r"failsafe|trip(?:ped)?|parked|discharg\w*|P1 feed|quarter-hour|"
+          r"payload|endpoint|JSON|API|timeout|boolean|config",
+    "nl": r"setpoints?|SoC|BMS|PV|failsafe|regelaar|regellus|"
+          r"latch|ontlad\w*|payload|endpoint|JSON|API|time-?out|boolean|"
+          r"config|kwartuur\w*",
+}
+JARGON = {k: re.compile(r"\b(?:" + v + r")\b", re.I) for k, v in JARGON.items()}
+# Details belong behind the page's DOCS link, never in the string itself.
+DETAILS = re.compile(r"https?:|www\.|DOCS|documentation, section|§|"
+                     r"\bsee section\b|\bzie sectie\b", re.I)
+NAME_WORDS, DESC_WORDS, LINE_SENTENCES = 6, 25, 2
+
+
+def kind_of(path):
+    if path[0] == "home_words":
+        return "template"          # part 4 renders and checks these
+    return "description" if path[-1] == "description" else "name"
+
+
+def problems(lang, path, text):
+    kind = kind_of(path)
+    out = []
+    if not isinstance(text, str) or not text.strip():
+        return ["empty"]
+    if kind == "name" and len(words(text)) > NAME_WORDS:
+        out.append(f"name over {NAME_WORDS} words ({len(words(text))})")
+    if kind == "name" and sentences(text) > LINE_SENTENCES:
+        out.append(f"over {LINE_SENTENCES} sentences ({sentences(text)})")
+    if kind == "description":
+        if sentences(text) > 1:
+            out.append(f"description over 1 sentence ({sentences(text)})")
+        if len(words(text)) > DESC_WORDS:
+            out.append(f"description over {DESC_WORDS} words "
+                       f"({len(words(text))})")
+    if ";" in text:
+        out.append("semicolon")
+    hit = JARGON[lang].search(PLACEHOLDER.sub("X", text))
+    if hit:
+        out.append(f"jargon: {hit.group(0)!r}")
+    if DETAILS.search(text):
+        out.append(f"details belong behind the DOCS link: "
+                   f"{DETAILS.search(text).group(0)!r}")
+    # The picker's own help names "entity id": the one place it is the word.
+    ok_entity = path[:2] == ("settings", "picker")
+    return out + [p for p in text_problems(text, keys=False, entities=False)
+                  if not (ok_entity and p.startswith("entity id"))]
+
+
+_bad = []
+for lang, data in (("en", EN), ("nl", NL)):
+    for path, text in leaves(data):
+        for p in problems(lang, path, text):
+            _bad.append(f"{where(lang, path)}: {p} :: {text!r}")
+for x in _bad:
+    print(f"       STYLE  {x}")
+check(f"every string in en.json and nl.json follows STYLE.md "
+      f"({len(_en) + len(_nl)} strings, {len(_bad)} breaking it)", not _bad)
+
+
+# ============================================================================ #
+print("\n3. the rule catches a spoiled input")
+check("a 7-word name is caught",
+      problems("en", ("fields", "x", "name"),
+               "One two three four five six seven"))
+check("a 2-sentence description is caught",
+      problems("nl", ("fields", "x", "description"), "Eén zin. Twee zinnen."))
+check("jargon is caught in English and in Dutch",
+      problems("en", ("x",), "Setpoint sent") and
+      problems("nl", ("x",), "De SoC is laag"))
+check("a link or section in a string is caught",
+      problems("en", ("x", "description"),
+               "See https://example.org for the rest."))
+check("a snake_case option key is caught",
+      problems("nl", ("x",), "Zet peak_cap_w hoger"))
+
+
+# ============================================================================ #
+print("\n4. Home's sentences, rendered in each language (as test_messages 8)")
+PLAN_WORDS, PLAN_SENTENCES = 12, 2
+
+
+def home_problems(kind, text):
+    if "{" in text or "}" in text:
+        return ["a placeholder was not filled"]
+    if kind == "title":
+        return title_problems(text)
+    out = text_problems(text, keys=False, entities=False)
+    if kind == "line":
+        if sentences(text) > 1 or len(words(text)) > 25:
+            out.append("line over 1 sentence of 25 words")
+        return out
+    if sentences(text) > PLAN_SENTENCES:
+        out.append(f"plan line over {PLAN_SENTENCES} sentences")
+    out += [f"plan sentence over {PLAN_WORDS} words: {x!r}"
+            for x in re.split(r"(?<=[.!?])\s+", text)
+            if len(words(x)) > PLAN_WORDS]
+    return out
+
+
+for lang in ("en", "nl"):
+    _samples = homeview.text_samples(lang)
+    _hb = [f"{lang} {k}: {p} :: {t!r}" for k, t in _samples
+           for p in home_problems(k, t)]
+    _hb += [f"{lang}: jargon {JARGON[lang].search(t).group(0)!r} :: {t!r}"
+            for _k, t in _samples if JARGON[lang].search(t)]
+    for x in _hb:
+        print(f"       HOME  {x}")
+    check(f"{lang}: every Home sentence follows its rule "
+          f"({len(_samples)} rendered, {len(_hb)} breaking it)",
+          len(_samples) > 80 and not _hb)
+_en_s = [t for _k, t in homeview.text_samples("en")]
+_nl_s = [t for _k, t in homeview.text_samples("nl")]
+check("Home in Dutch is not Home in English: most sentences differ, and "
+      "numbers use a decimal comma",
+      sum(a != b for a, b in zip(_en_s, _nl_s)) > 0.9 * len(_en_s)
+      and "2,5 kW" in homeview.text_samples("nl").__repr__()
+      and "2.5 kW" in _en_s.__repr__())
+check("the language resets after a Dutch build, so English callers stay "
+      "English", homeview.pill("running") == EN["home_words"]["pill"]["running"])
+
+
+# ============================================================================ #
+print("\n5. no Dutch string is left in English")
+# Words that are the same in both, or names. Anything else equal is untranslated.
+SAME = {"Meter", "Timing", "Support", "Details", "Alarm", "Info", "per kWh",
+        "{hour}:00 UTC", "Flanders, Fluvius Antwerpen", "Modus", "Status"}
+_same = sorted(f"{where('nl', p)} = {t!r}" for p, t in _nl.items()
+               if p in _en and t == _en[p] and t not in SAME
+               and PLACEHOLDER.sub("", t).strip(" .:,"))
+for x in _same:
+    print(f"       ENGLISH  {x}")
+check(f"every Dutch string is Dutch ({len(_same)} still English)", not _same)
+check("mutation: an English string in nl.json is caught",
+      "Save" != NL["settings"]["savebar"]["save"] and "Save" not in SAME)
+
+
+# ============================================================================ #
+print("\n6. the words that mirror app/messages.py")
+check("the setup-only banner on Home is messages.banner_setup_only()",
+      EN["home"]["setup_only"]["name"] == messages.banner_setup_only())
+_mirror = {k: (EN["home_words"]["attn"][k], v)
+           for k, v in homeview.ATTN_FROM_MESSAGES.items()}
+_drift = {k: v for k, v in _mirror.items() if v[0] != v[1]}
+check(f"five Home titles are the notification's own title ({_drift})",
+      len(_mirror) == 5 and not _drift)
+check("app/uitext.py falls back to English per key and reads nl-BE as nl",
+      uitext.lang_of("nl-BE") == "nl" and uitext.lang_of("fr") == "en"
+      and uitext.words("nl")["home"]["tabs"]["home"]
+      == NL["home"]["tabs"]["home"]
+      and uitext._merge({"a": {"b": 1, "c": 2}}, {"a": {"b": 3}})
+      == {"a": {"b": 3, "c": 2}})
+
+print()
+if fails:
+    print(f"{len(fails)} FAILED")
+    sys.exit(1)
+print("all passed")

goodwe_controller/test_uimodel.py

@@ -217,6 +217,109 @@ check("the hook answers None while battery modes do not exist",
 check("so the toggle is stored as the page has it",
       edit(DEFAULTS, arbitrage_enabled=True)["arbitrage_enabled"] is True)
 
+print("\n7. the time-window editor (UX-13 P5)")
+
+
+def rows(*spec):
+    return [{"from": a, "to": b, "days": d, "price": p} for a, b, d, p in spec]
+
+
+def periods(r, base=SITE):
+    return edit(base, ui__contract="custom", ui__fallback="custom",
+                ui__periods=r)
+
+
+def refused(r):
+    """(code, values) of the DeriveError the rows give, or None."""
+    try:
+        periods(r)
+    except U.DeriveError as err:
+        return err.code, err.values
+    return None
+
+
+# Five windows the day/night preset cannot say: a weekday peak, a weekday
+# night, Saturday split at noon, and Sunday.
+_five = rows(("06:30", "21:15", "mon-fri", 0.31), ("21:15", "06:30", "mon-fri", 0.19),
+             ("00:00", "12:00", "sat", 0.2), ("12:00", "00:00", "sat", 0.25),
+             ("00:00", "24:00", "sun", 0.18))
+_p5 = periods(_five)
+_prof5 = parse_static_profile(_p5["static_profile"])
+check("five odd windows write a profile the tariff parser reads, with every "
+      "price in place", [p.eur_per_kwh for p in _prof5.periods]
+      == [0.31, 0.19, 0.2, 0.25, 0.18] and _prof5.periods[3].end_min == 1440)
+check("...that the shipped start checks accept, and that reads back as the "
+      "same rows", not validate_startup_config(_p5)
+      and U.options_to_ui(_p5)["ui.contract"] == "custom"
+      and [(r["from"], r["to"], r["days"], r["price"])
+           for r in U.options_to_ui(_p5)["ui.periods"]]
+      == [("06:30", "21:15", "mon-fri", 0.31), ("21:15", "06:30", "mon-fri", 0.19),
+          ("00:00", "12:00", "sat", 0.2), ("12:00", "24:00", "sat", 0.25),
+          ("00:00", "24:00", "sun", 0.18)])
+_named = dict(SITE, static_profile=json.dumps({"periods": [
+    {"name": "peak", "from": "08:00", "to": "20:00", "days": "mon-sun",
+     "eur_per_kwh": 0.33},
+    {"name": "offpeak", "from": "20:00", "to": "08:00", "days": "mon-sun",
+     "eur_per_kwh": 0.21}]}))
+_rows = U.options_to_ui(_named)["ui.periods"]
+_rows[1]["price"] = 0.2
+check("a stored profile's window names are kept when a price changes",
+      [p.name for p in parse_static_profile(periods(_rows, base=_named)
+                                            ["static_profile"]).periods]
+      == ["peak", "offpeak"])
+check("the day and night preset shows as three rows, so 'Other time windows' "
+      "starts from what is stored",
+      [r["days"] for r in U.options_to_ui(
+          edit(SITE, ui__contract="daynight", ui__day_price=0.3,
+               ui__night_price=0.2))["ui.periods"]]
+      == ["mon-fri", "mon-fri", "sat,sun"])
+check("an overlap is named: the two windows, the day and the times",
+      refused(rows(("07:00", "23:00", "mon-fri", 0.3),
+                   ("22:00", "07:00", "mon-fri", 0.2),
+                   ("00:00", "24:00", "sat,sun", 0.2)))
+      == ("period_overlap", {"day": "mon", "from": "22:00", "to": "23:00",
+                             "a": 1, "b": 2}))
+check("a gap is named: the day and the times",
+      refused(rows(("07:00", "22:00", "mon-sun", 0.3),
+                   ("22:00", "24:00", "mon-sun", 0.2)))
+      == ("period_gap", {"day": "mon", "from": "00:00", "to": "07:00"}))
+check("a gap on one day only is found on that day",
+      refused(rows(("00:00", "24:00", "mon-fri", 0.3),
+                   ("00:00", "24:00", "sat", 0.2)))
+      == ("period_gap", {"day": "sun", "from": "00:00", "to": "24:00"}))
+check("bad times are named by window: '7h', '25:00', '07:60', '24:00' as a "
+      "start", all(refused(rows(("00:00", "24:00", "mon-sun", 0.2), (a, b, "mon", 0.1)))
+                   == ("period_time", {"row": 2}) for a, b in
+                   (("7h", "08:00"), ("25:00", "08:00"), ("07:60", "08:00"),
+                    ("24:00", "08:00"), ("07:00", "")))
+      and refused(rows(("7:00", "07:00", "mon-sun", 0.2)))
+      == ("period_zero", {"row": 1}))
+check("an empty price, and a price in cents, are named by window",
+      refused(rows(("00:00", "24:00", "mon-sun", None)))
+      == ("period_price", {"row": 1})
+      and refused(rows(("00:00", "24:00", "mon-sun", 34)))
+      == ("period_price_range", {"row": 1}))
+check("no windows at all is refused", refused([]) == ("no_periods", {}))
+from app import uipage                                          # noqa: E402
+_msg = uipage.derive_message(U.DeriveError("x", "period_overlap", "ui.periods",
+                                           day="sat", a=1, b=3, **{
+                                               "from": "06:00", "to": "07:00"}))
+_nl = uipage.derive_message(U.DeriveError("x", "period_gap", "ui.periods",
+                                          day="sun", **{"from": "00:00",
+                                                        "to": "07:00"}), "nl")
+check(f"the page shows the error beside the editor, with the day by name "
+      f"({_msg['text']!r}, {_nl['text']!r})",
+      _msg["field"] == "ui.periods" and "Windows 1 and 3" in _msg["text"]
+      and "Saturday 06:00 to 07:00" in _msg["text"]
+      and "zondag 00:00 tot 07:00" in _nl["text"])
+_raw = json.dumps({"periods": [
+    {"from": "00:00", "to": "24:00", "days": "mon,wed", "eur_per_kwh": 0.2},
+    {"from": "00:00", "to": "24:00", "days": "tue,thu-sun", "eur_per_kwh": 0.3}]})
+check("days the editor has no choice for stay in the Configuration tab, and "
+      "survive a save", U.options_to_ui(dict(SITE, static_profile=_raw))
+      ["ui.periods"] is None and edit(dict(SITE, static_profile=_raw), gain=0.5)
+      ["static_profile"] == _raw)
+
 print()
 if fails:
     print(f"{len(fails)} FAILED")

goodwe_controller/tools/style_rules.py

@@ -0,0 +1,58 @@
+"""STYLE.md sections 1 and 4 as code: the banned words and the counts.
+
+Shared by test_messages.py (UX-08) and test_ui_text.py (UX-13 P5), so the two
+checks cannot drift apart. Moved here unchanged from test_messages.py.
+"""
+
+import re
+
+BANNED = re.compile(
+    r"\b(?:(?:SAFETY|TARIFF|TEL|CFG|FCST|OPT|UX|HW|FW|WITNESS|PKG|ARCH)-\d+|"
+    r"integrator|anti-?windup|windup|clamp(?:ed|s)?|i_clamped|saturat\w*|"
+    r"BUG SIGNAL|latch(?:ed)?|arbiter|allocator|registers?|0x[0-9A-Fa-f]+|"
+    r"layer [123]|heartbeat|watchdog|telegrams?|ACKs?|CRC|OTA|Modbus|planner|"
+    r"capaciteitstarief|journalctl|ssh|grep|"
+    r"\d+\.\d+\.\d+\.\d+|[\w-]+\.(?:py|md|yaml|json|db))\b|§\s?\d", re.I)
+ENTITY = re.compile(r"\b(?:sensor|number|binary_sensor|input_\w+|switch|select)"
+                    r"\.[a-z0-9_*]+")
+SNAKE = re.compile(r"\b[a-z0-9]+(?:_[a-z0-9]+)+\b")
+SHOUT = re.compile(r"\b[A-Z]{2,}[A-Z0-9]*(?:[\s-]+[A-Z]{2,}[A-Z0-9]*)+\b")
+PLACEHOLDER = re.compile(r"\{[^{}]*\}|%[-+ #0-9.]*[sdrfgx%]")
+
+
+def words(text):
+    return [w for w in re.findall(r"\S+", PLACEHOLDER.sub("X", text))
+            if re.search(r"[A-Za-z0-9]", w)]
+
+
+def sentences(text):
+    """Sentence count: a stop followed by a space and a capital, or the end."""
+    t = PLACEHOLDER.sub("X", text.strip())
+    t = re.sub(r"\b(e\.g|i\.e|etc)\.", "eg", t)
+    return len([s for s in re.split(r"[.!?](?:\s+|$)", t) if s.strip()])
+
+
+def title_problems(title):
+    out = []
+    if len(words(title)) > 5:
+        out.append(f"title over 5 words ({len(words(title))})")
+    if title.lower().startswith("goodwe"):
+        out.append("title carries a GoodWe prefix")
+    if title.rstrip().endswith("."):
+        out.append("title ends in a full stop")
+    return out + text_problems(title, keys=False, entities=False)
+
+
+def text_problems(text, *, keys, entities):
+    t = PLACEHOLDER.sub("X", text)
+    out = []
+    hit = sorted({m.group(0) for m in BANNED.finditer(t)})
+    if hit:
+        out.append("banned: " + ", ".join(hit[:4]))
+    if not entities and ENTITY.search(t):
+        out.append("entity id: " + ENTITY.search(t).group(0))
+    if not keys and SNAKE.search(ENTITY.sub("", t)):
+        out.append("option key: " + SNAKE.search(ENTITY.sub("", t)).group(0))
+    if SHOUT.search(t):
+        out.append("capitals: " + SHOUT.search(t).group(0))
+    return out

goodwe_controller/tools/ux13_demo.py

@@ -1,7 +1,8 @@
 """UX-13: serve the real page and routes over a fixture controller, for a
 headless browser check.  `python3 tools/ux13_demo.py STATE PORT [HOST]`
 
-STATE is running, shadow or alarm. The controller is the shipped `Controller`
+STATE is running, shadow, alarm, new (P4) or setup (UX-15's setup-only
+mode, P5). The controller is the shipped `Controller`
 with its readings set by hand (two batteries, solar, today's prices in the
 mockup's shape, trading on). Nothing here talks to Home Assistant or to an
 inverter: `/action` changes only this fixture. Used for the P1 render check
@@ -35,6 +36,7 @@ from aiohttp import web as aioweb                                # noqa: E402
 
 from app import homeview, web                                    # noqa: E402
 from app.main import Controller                                  # noqa: E402
+from app.setuponly import SetupOnly                              # noqa: E402
 from app.peakguard import PeakDecision                           # noqa: E402
 from app.price import PricePoint, PriceProduct, PriceRead        # noqa: E402
 from app.static_tariff import TariffPlan                         # noqa: E402
@@ -203,8 +205,9 @@ class Supervisor:
     async def info(self):
         return {"options": json.loads(json.dumps(self.options)),
                 "schema": schema_ui(CONFIG),
-                "translations": {"en": TL.parse_translation_file(
-                    os.path.join(HERE, "translations", "en.yaml"))}}
+                "translations": {lang: TL.parse_translation_file(
+                    os.path.join(HERE, "translations", f"{lang}.yaml"))
+                    for lang in ("en", "nl")}}
 
     async def write_options(self, options):
         self.options = json.loads(json.dumps(options))
@@ -255,7 +258,20 @@ def controller(state):
     return c
 
 
+class ReadOnlyHass(Hass):
+    read_only = True        # app/setuponly.py serves only on a read-only HA
+
+
 async def main(state, port, host="127.0.0.1"):
+    if state == "setup":
+        # UX-15's setup-only mode: shipped defaults, nothing controlled.
+        stored = defaults(CONFIG)
+        c = SetupOnly(dict(stored), ReadOnlyHass(), Store())
+        runner = aioweb.AppRunner(web.build_app(c, Supervisor(stored)))
+        await runner.setup()
+        await aioweb.TCPSite(runner, host, port).start()
+        print(f"serving setup on http://127.0.0.1:{port}/", flush=True)
+        await asyncio.Event().wait()
     if state == "new":
         stored = dict(defaults(CONFIG), setpoint_entity="number.a")
         store = Store()

goodwe_controller/tools/ux13_screenshots.py

@@ -0,0 +1,96 @@
+"""UX-13 P5: the DOCS screenshots of the new screens, taken from the real page.
+
+Run by tools/ux13_screenshots.sh, which serves tools/ux13_demo.py fixtures and
+runs this inside the Playwright image. Each shot fails the run on a page
+error, so a broken screen is never pictured.
+
+    python3 ux13_screenshots.py OUT_DIR    # DEMO_<STATE> = the fixture's URL
+
+The battery-mode screens (P3) are not built, so there is no shot of them:
+DOCS.md says so instead of showing a mock-up.
+"""
+
+import os
+import sys
+
+from playwright.sync_api import sync_playwright
+
+OUT = sys.argv[1]
+DESKTOP = {"width": 1000, "height": 900}
+PHONE = {"width": 390, "height": 844}
+
+
+def url(state):
+    return os.environ[f"DEMO_{state.upper()}"]
+
+
+def shot(browser, name, state, route, *, lang="en-GB", size=DESKTOP,
+         full=True, act=None, only=None):
+    ctx = browser.new_context(locale=lang, viewport=size,
+                              color_scheme="light", reduced_motion="reduce")
+    page = ctx.new_page()
+    errors = []
+    page.on("pageerror", lambda e: errors.append(str(e)))
+    page.goto(url(state) + route)
+    page.wait_for_load_state("networkidle")
+    page.wait_for_timeout(1500)             # the first /status and checks
+    if act:
+        act(page)
+        page.wait_for_timeout(1500)         # the debounced start checks
+    path = os.path.join(OUT, name + ".png")
+    if only:
+        page.locator(only).screenshot(path=path)
+    else:
+        page.screenshot(path=path, full_page=full)
+    ctx.close()
+    if errors:
+        raise SystemExit(f"{name}: page errors {errors}")
+    print(f"  {name}.png")
+
+
+def open_tariff(page):
+    page.locator("details.grp[data-g=tariff] > summary").click()
+    page.locator("details.grp[data-g=meter] > summary").click()   # close it
+    # The fixture site is on a dynamic contract: its fallback gets windows.
+    page.get_by_role("radiogroup", name="Price when the feed is down") \
+        .get_by_role("radio", name="Other time windows").click()
+
+
+def windows(page, overlap=False):
+    open_tariff(page)
+    add = page.get_by_role("button", name="+ Add a time window")
+    rows = (("07:00", "23:00" if overlap else "22:00", "mon-fri", "0.34"),
+            ("22:00", "07:00", "mon-fri", "0.26"),
+            ("00:00", "24:00", "sat,sun", "0.24"))
+    for i, (a, b, days, price) in enumerate(rows, start=1):
+        add.click()
+        page.get_by_label(f"Window {i}, From").fill(a)
+        page.get_by_label(f"Window {i}, To").fill(b)
+        page.get_by_label(f"Window {i}, Days").select_option(days)
+        page.get_by_label(f"Window {i}, Price").fill(price)
+    page.locator("[data-key='ui.periods']").scroll_into_view_if_needed()
+
+
+def main():
+    os.makedirs(OUT, exist_ok=True)
+    with sync_playwright() as p:
+        b = p.chromium.launch()
+        shot(b, "home-running", "running", "#home")
+        shot(b, "home-running-nl", "running", "#home", lang="nl-BE")
+        shot(b, "home-shadow", "shadow", "#home")
+        shot(b, "home-phone", "running", "#home", size=PHONE)
+        shot(b, "home-setup-only", "setup", "#home", full=False)
+        shot(b, "settings-installer", "running", "#settings")
+        shot(b, "settings-installer-nl", "running", "#settings", lang="nl-BE")
+        tariff = "details.grp[data-g=tariff]"
+        shot(b, "settings-time-windows", "running", "#settings",
+             act=windows, only=tariff)
+        shot(b, "settings-time-windows-overlap", "running", "#settings",
+             act=lambda page: windows(page, overlap=True), only=tariff)
+        shot(b, "setup-step-1", "new", "#setup")
+        shot(b, "setup-step-1-nl", "new", "#setup", lang="nl-BE")
+        b.close()
+
+
+if __name__ == "__main__":
+    main()

goodwe_controller/tools/ux13_screenshots.sh

@@ -0,0 +1,43 @@
+#!/bin/sh
+# UX-13 P5: regenerate the DOCS screenshots in docs/img/ux13/ from the real page.
+#
+#   sh goodwe_controller/tools/ux13_screenshots.sh [OUT_DIR]
+#
+# Serves tools/ux13_demo.py's fixtures (running, shadow, new, setup) in the CI
+# test image, then runs tools/ux13_screenshots.py in the Playwright image on a
+# private Docker network (the image has the browsers; the matching Python
+# package is installed into the container on each run). Nothing talks to Home Assistant or an inverter. The
+# prices and the "now" line follow the clock, so the pictures change a little
+# from run to run. Needs Docker and PyPI access; pulls the Playwright image once.
+set -eu
+HERE=$(cd "$(dirname "$0")/.." && pwd)
+OUT=${1:-$HERE/../docs/img/ux13}
+PW=mcr.microsoft.com/playwright/python:v1.55.0-noble
+NET=ux13-shots-$$
+STATES="running shadow new setup"
+mkdir -p "$OUT"
+OUT=$(cd "$OUT" && pwd)
+
+cleanup() {
+    for s in $STATES; do docker rm -f "$NET-$s" >/dev/null 2>&1 || true; done
+    docker network rm "$NET" >/dev/null 2>&1 || true
+}
+trap cleanup EXIT INT TERM
+
+docker build -q -t goodwe-addon-checks:1 "$HERE/../.gitea/ci" >/dev/null
+docker network create "$NET" >/dev/null
+ENVS=""
+for s in $STATES; do
+    docker run -d --name "$NET-$s" --network "$NET" -e PYTHONDONTWRITEBYTECODE=1 \
+        -v "$HERE:/w:ro" goodwe-addon-checks:1 \
+        python3 /w/tools/ux13_demo.py "$s" 8099 0.0.0.0 >/dev/null
+    ENVS="$ENVS -e DEMO_$(echo "$s" | tr a-z A-Z)=http://$NET-$s:8099/"
+done
+sleep 3
+# shellcheck disable=SC2086
+docker run --rm --network "$NET" --user "$(id -u):$(id -g)" -e HOME=/tmp \
+    $ENVS -v "$HERE/tools:/t:ro" -v "$OUT:/out" "$PW" \
+    sh -euc 'pip install -q --disable-pip-version-check --target /tmp/pw \
+                 playwright==1.55.0
+             PYTHONPATH=/tmp/pw python3 /t/ux13_screenshots.py /out'
+echo "screenshots in $OUT"

goodwe_controller/tools/ux13_wizard_blobs.py

@@ -10,7 +10,8 @@ own validator run over them.
 The wizard edits the page model one step at a time and saves it through
 uipage.to_options(), like the Installer view. `blobs()` walks each step's
 choices (meter source and sign, one to three inverters, solar rows, every
-contract and price source, region, peak limit, shadow mode) from a new
+contract and price source, time windows (P5), region, peak limit, shadow
+mode) from a new
 install as shipped, one with a power request entity, and the TEST-23 sites, and keeps what the shipped validator
 accepts, because the wizard saves nothing it refuses. test_setup.py checks
 the set; `--supervisor` runs it through Supervisor 2026.08.0's `AppOptions`
@@ -103,6 +104,29 @@ PRICES = {
     "csv": {"ui.contract": "dynamic", "price_provider": "manual_csv",
             "price_csv_path": "/share/prices.csv", "ui.fallback": "fixed",
             "ui.fixed_price": 0.3},
+    # P5: the time-window editor, odd windows the day/night preset cannot say.
+    "periods": {"ui.contract": "custom", "ui.fallback": "custom",
+                "ui.periods": [
+                    {"from": "06:30", "to": "21:15", "days": "mon-fri",
+                     "price": 0.31},
+                    {"from": "21:15", "to": "06:30", "days": "mon-fri",
+                     "price": 0.19},
+                    {"from": "00:00", "to": "12:00", "days": "sat",
+                     "price": 0.2},
+                    {"from": "12:00", "to": "24:00", "days": "sat",
+                     "price": 0.25},
+                    {"from": "00:00", "to": "24:00", "days": "sun",
+                     "price": 0.18}]},
+    "periods_one": {"ui.contract": "custom", "ui.fallback": "custom",
+                    "ui.periods": [{"from": "00:00", "to": "00:00",
+                                    "days": "mon-sun", "price": 0.29}]},
+    "dynamic_periods": {"ui.contract": "dynamic",
+                        "price_provider": "generic_dayahead",
+                        "ui.fallback": "custom", "ui.periods": [
+                            {"from": "07:00", "to": "23:00",
+                             "days": "mon-sun", "price": 0.32},
+                            {"from": "23:00", "to": "07:00",
+                             "days": "mon-sun", "price": 0.21}]},
 }
 REGIONS = {"flanders": {"ui.region": "flanders"},
            "own": {"ui.region": "own", "price_taxes_eur_kwh": 0.15}}
@@ -139,6 +163,9 @@ def plans():
              "shadow": "on"},
             {"meter": "mqtt", "roster": "two", "solar": "none",
              "prices": "formula", "region": "flanders", "peak": "low",
+             "shadow": "on"},
+            {"meter": "dsmr", "roster": "two", "solar": "one",
+             "prices": "periods", "region": "flanders", "peak": "forecast",
              "shadow": "on"}):
         seen.append(plan)
     return seen