- Add i18next, react-i18next, i18next-browser-languagedetector packages
- Configure i18n initialization with language detector in lib/i18n.ts
- Created en/de translation files and moved most hard-coded strings into the files and translated them
- Uses locale-aware date formatting where applicable
- Added language-specific Wikipedia content files (wikipedia.en.json, wikipedia.de.json) and updated download URLs
- Added NOMAD_REPO_URL env variable for fork-friendly URL resolution (easier testing and rollout independent of Crosstalk repo)
