Add Multilingual README Support

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PULL_REQUEST.md

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+# Add Multilingual README and Description Support
+
+## Summary
+
+This PR adds support for multilingual README files and repository descriptions in HACS. The frontend passes the user's Home Assistant language setting (`hass.language`) to the backend via the `hacs/repository/info` and `hacs/repositories/list` WebSocket commands. The backend handles all language processing, file selection, and fallback logic.
+
+## Related Backend PR
+
+This frontend implementation requires the corresponding backend changes:
+- **Backend PR:** https://github.com/hacs/integration/pull/4965
+
+## Changes
+
+1. **Repository Information Fetching** (`src/data/repository.ts`)
+   - Added `language` parameter to `fetchRepositoryInformation()` function
+   - Always includes `language` field in WebSocket message (uses `hass.language` as fallback)
+
+2. **Repository List** (`src/data/websocket.ts`)
+   - Added `language` parameter to `getRepositories()` function
+   - Passes language to backend for multilingual description support
+
+3. **Repository Dashboard** (`src/dashboards/hacs-repository-dashboard.ts`)
+   - Passes `hass.language` when fetching repository information
+   - Detects language changes in `updated()` lifecycle hook and automatically refetches repository data
+
+4. **Download Dialog** (`src/components/dialogs/hacs-download-dialog.ts`)
+   - Passes `hass.language` when fetching repository information
+
+## Checklist
+
+- [x] Code follows project style guidelines
+- [x] Changes are backward compatible
+- [x] Code tested locally
+- [x] TypeScript types are correct
+- [x] Works with backend PR #4965
+
+## Notes
+
+- This PR only implements the frontend changes. The backend must be updated separately (PR #4965).
+- Repository maintainers can provide multilingual README files using the pattern `README.{language_code}.md` (e.g., `README.de.md`, `README.fr.md`). The default `README.md` is always used as fallback.
+- Repository descriptions can also be multilingual using `DESCRIPTION.{language_code}.txt` files (e.g., `DESCRIPTION.de.txt`, `DESCRIPTION.fr.txt`). Falls back to GitHub repository description if not found.
+