UX-08 2c: short refusals, error texts and option texts

Validator refusals name the setting by its label and key, say what is
wrong and what to change, and keep the rejected value and limit. Option
names and descriptions are short in en and nl; citations moved to DOCS
"For installers" and the test_translations citation check now pins the
instruction on the tab and the record in DOCS. No rule, key, schema,
default or exit code changed. Allowlist 167 -> 43 (log lines only).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LyR88rXETvwhTgx6yHE39p

goodwe_controller/test_tool_inputs.py

@@ -86,7 +86,7 @@ check("baseline: the bare options object is CLEARED (exit 0)",
       code == 0 and "CLEARED for deploy" in out)
 code, out = gate(dump("bare-bad.json", dict(BARE, slew_w=5000)))
 check("baseline: the bare object with slew_w 5000 is REFUSED by the validator",
-      code == 1 and "slew_w is 5000 W" in out)
+      code == 1 and "(slew_w) is 5000 W" in out)
 
 for label, doc in (("wrapped", ha_apps_info(BARE)),
                    ("wrapped, slew_w 5000", ha_apps_info(dict(BARE, slew_w=5000)))):