First export from translatewiki.net with https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1166671
[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/+/1167939 | patch]])
[X] Add to RELEASE-NOTES
[X] Add namespace translations ([[https://incubator.wikimedia.org/wiki/Talk:Wp/aig/Mien_Piej | asked]])([[https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1168631|patch]])
-- [x] Check that namespace translations don't conflict with language codes
[ ] Remove from translatewiki after deploying the core change ([[https://gerrit.wikimedia.org/r/c/translatewiki/+/1169204 | patch]])
-- [ ] `mw-config/LanguageSettings.php`
[ ] Test language search in UniversalLanguageSelector and fix the search index (if needed)