# ISSUE-225 Artifact — Backend i18n baseline (resolver + fallback)

Issue: **#225** (`[MVP][READY] #175-A: Backend i18n baseline (resolver + fallback)`)

## Scope verified

- Backend locale resolver supports `da` + `en` and normalizes language tags.
- Unsupported locale requests fall back to default locale (`en`).
- Error payload contract is stable for API errors:
  - `error_code`
  - `error`
  - `locale`

## Implementation references

- Locale resolution + fallback chain:
  - `lobby/i18n.py`
  - `resolve_locale()`
  - `resolve_error_message()`
  - `api_error()`
- Shared locale contract source:
  - `shared/i18n/lobby.json` (`locales.default=en`, supported includes `en`, `da`)

## Acceptance checks run

Command:

```bash
.venv/bin/python manage.py test \
  lobby.tests.I18nResolverTests \
  lobby.tests.LobbyFlowTests \
  lobby.tests.StartRoundTests
```

Result (2026-03-02):

- `Ran 28 tests in 24.781s — OK`
- `System check identified no issues (0 silenced).`
- Confirms resolver behavior for locale normalization + fallback and stable error payload fields across flow endpoints.

## Notes

- Existing merged follow-ups in `main` include Accept-Language parsing fixes for q-values and locale tag normalization.
- This artifact documents the final baseline state and verification evidence for #225.