First export from translatewiki with https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1056790
[ ] Verify autonym correctness in language-data
[ ] Add to Wikifunctions's language list in function-schemata
[ ] Add to `includes/languages/data/Names.php`
[ ] Add to RELEASE-NOTES
[ ] Set fallback if needed
-- [ ] In core (`languages/messages/Messages*.php`)
-- [ ] In jquery.i18n (`src/jquery.i18n.fallbacks.js`)
-- [ ] Remove fallback gender aliases if needed
[ ] Set rtl if needed
-- [ ] In core (`languages/messages/Messages*.php`)
-- [ ] In MobileFrontend (`src/mobile.languages.structured/rtlLanguages.js`)
[ ] Add namespace translations
-- [ ] Add gender aliases if needed
-- [ ] Check that namespace translations don't conflict with language codes
[ ] Add $linkTrail
[ ] Add date formats (if needed)
[ ] Add digit conversion (if needed)
[ ] Define wider line-height in `resources/src/mediawiki.skinning/i18n-headings.less` (if needed)
[ ] Remove the language from Wikibase and WikibaseLexeme (if needed)
[ ] 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)