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/test_static_tariff.py

@@ -859,7 +859,7 @@ check("static_profile alongside the Home Assistant price entities is refused - "
       why(validate_startup_config(
           vbase(static_profile=json.dumps(TWO_PERIOD),
                 price_now_entity="sensor.now", price_avg_entity="sensor.avg"),
-          -5000, 5000), "Home Assistant price entities would count"))
+          -5000, 5000), "(price_avg_entity) would win over it"))
 check("...and the Home Assistant pair ALONE still starts, so nothing is taken "
       "away from a live install",
       validate_startup_config(vbase(price_now_entity="sensor.now",