First export from translatewiki with https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1087734
[x] Verify autonym correctness in language-data
[] Add to Wikifunctions's language list in function-schemata
[x] Add to `includes/languages/data/Names.php` ([[ https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1090896 | patch ]])
[] Add to RELEASE-NOTES ([[ https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1090896 | patch ]])
[] Set fallback if needed
-- [] In core (`languages/messages/Messages*.php`) ([[ https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1094073 | patch ]])
-- [] In jquery.i18n (`src/jquery.i18n.fallbacks.js`) ([[ https://github.com/wikimedia/jquery.i18n/pull/292 | patch ]])
-- [] Remove fallback gender aliases if needed ([[ https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1094073 | patch ]])
[ ] Add namespace translations ([[ https://translatewiki.net/wiki/User_talk:Muisha_wiki_hke#Namespace_translations | requested ]]) ([[ https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1094073 | patch ]])
-- [] Check that namespace translations don't conflict with language codes
[] Add $linkTrail ([[ https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1094073 | patch ]])
[] 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)