# ISSUE-175 Artifact — shared i18n contract + MVP host/player flow

## Delivered
- Shared i18n contract is centralized in `shared/i18n/lobby.json` (da/en, default `en`, robust fallback).
- Frontend host/player MVP copy is read via shared keys (no hardcoded Danish strings in Angular MVP flow components).
- Backend error messages resolve from shared keyspace with locale-aware API payload (`error_code`, `error`, `locale`).
- Audio-routing policy is explicit and shared: `frontend.capabilities.client_has_no_audio_output=true`.
- Architecture + key naming documented in `docs/I18N_ARCHITECTURE.md`.

## Smoke / e2e evidence
### Backend locale + fallback
Command:
```bash
. .venv/bin/activate && python manage.py test \
  lobby.tests.LobbyFlowTests.test_join_error_localizes_to_danish_with_accept_language_header \
  lobby.tests.LobbyFlowTests.test_join_error_falls_back_to_english_for_unsupported_locale \
  lobby.tests.I18nResolverTests
```
Result:
- PASS (7 tests)
- Confirms `da` localization and fallback to `en` for unsupported locale.

### Frontend host/player + language switch + audio policy
Command:
```bash
cd frontend/angular
npm test -- --run \
  src/app/lobby-i18n.spec.ts \
  src/app/i18n-mvp-flow-smoke.spec.ts \
  src/app/features/host/host-shell.component.spec.ts \
  src/app/features/player/player-shell.component.spec.ts
```
Result:
- PASS (22 tests)
- Includes smoke for host/player copy in **both en and da** and verifies primary-only audio policy flag (`clientHasNoAudioOutput=true`).