UX-08 2c review: unit settings anchor to inverters, plainer texts

- messages.setting() for one inverter in the list reads
  “Inverter rating” for inverter-b (inverters.max_w), so the config panel
  files per-unit reasons under `inverters`, where the value is changed.
- The tariff card and plausibility reasons name
  “Distribution, levies and VAT” (price_taxes_eur_kwh) again.
- The wrong-direction reasons say "safety stop", the sign_disagree_w
  option says what it protects, and the roster, price-entity,
  integrator_max_w and capacity_kwh texts read more plainly.
- NL: stuurprint -> stuurmodule, "De piekbeperking".

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

goodwe_controller/app/messages.py

@@ -844,5 +844,9 @@ LABELS = {
 
 
 def setting(key: str, unit: str = "") -> str:
-    """`max_w` -> `“Inverter rating” (max_w)`, plus ` for inverter-b` in a list."""
-    return f"“{LABELS[key]}” ({key})" + (f" for {unit}" if unit else "")
+    """`max_w` -> `“Inverter rating” (max_w)`. For one inverter in a list it is
+    `“Inverter rating” for inverter-b (inverters.max_w)`, so the config panel
+    also shows the reason beside `inverters`, where that value is changed."""
+    if unit:
+        return f"“{LABELS[key]}” for {unit} (inverters.{key})"
+    return f"“{LABELS[key]}” ({key})"