First export from translatewiki.net with https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1161336
[] Verify autonym correctness in language-data
[] Add to Wikifunctions's language list in function-schemata
[] Add to `includes/languages/data/Names.php` ([[ https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1162984 | patch ]])
[] Add to RELEASE-NOTES ([[ https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1162984 | patch ]])
[] Set fallback if needed
-- [] In core (`languages/messages/Messages*.php`)
-- [] In jquery.i18n (`src/jquery.i18n.fallbacks.js`)
-- [] Remove fallback gender aliases if needed
[] Add namespace translations
-- [] Check that namespace translations don't conflict with language codes
[] Add $linkTrail
[] Remove from translatewiki after deploying the core change
-- [] `mw-config/LanguageSettings.php`
-- [] `mw-config/FallbackSettings.php`
[] Test language search in UniversalLanguageSelector and fix the search index (if needed)