First export from translatewiki with https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1087734
- Verify autonym correctness in language-data
- Add to Wikifunctions's language list in function-schemata
- Add to includes/languages/data/Names.php (patch)
- Add to RELEASE-NOTES (patch)
- Set fallback if needed
- Add namespace translations (requested) (patch)
- Check that namespace translations don't conflict with language codes
- Add $linkTrail (patch)
- Remove from translatewiki after deploying the core change (patch)
- mw-config/LanguageSettings.php
- mw-config/FallbackSettings.php
- Test language search in UniversalLanguageSelector and fix the search index (if needed)