Review the Polish translation catalogue as a native speaker

[ralleur]

Goal

Review the Polish interface catalogue as a native speaker, with particular attention to wording that avoids unsupported plural forms.

Scope

• Review app/messages/pl.json against app/messages/en.json and app/messages/de.json.
• Cover setup, room/device management, connection errors and normal panel/phone navigation.
• Preserve every key, placeholder and formatting marker exactly.
• Keep count-dependent wording grammatically safe with the current message format; do not introduce unsupported plural syntax.
• Do not change product behaviour or add new messages in this issue.

Acceptance criteria

• Every Polish key has been reviewed in context.
• Placeholders and message structure still match the source catalogues.
• Count-dependent messages remain grammatically sound without unsupported plural forms.
• Terminology for Home Assistant, rooms, devices, setup and actions is consistent.
• cd app && npm test passes.
• cd app && npm run check passes.
• The Polish locale is smoke-tested in the app with no visibly truncated setup labels.