First export from translatewiki.net with https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1028246
- Verify autonym correctness in language-data (patch)
- Add to includes/languages/data/Names.php (patch)
- Add to RELEASE-NOTES (patch)
- Set fallback if needed
- Add $linkTrail (patch)
- Remove from translatewiki after deploying the core change
- Test language search in UniversalLanguageSelector and fix the search index if needed (patch)