First export from translatewiki.net with https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1028246
[v] Verify autonym correctness in language-data ([[ https://github.com/wikimedia/language-data/pull/341 | patch ]])
[v] Add to `includes/languages/data/Names.php` ([[ https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1028358 | patch ]])
[v] Add to RELEASE-NOTES ([[ https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1028358 | patch ]])
[v] Set fallback if needed
-- [v] In core (`languages/messages/Messages*.php`) ([[ https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1028358 | patch ]])
-- [v] In jquery.i18n (`src/jquery.i18n.fallbacks.js`) ([[ https://github.com/wikimedia/jquery.i18n/pull/279 | patch ]])
[v] Add $linkTrail ([[ https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1028358 | patch ]])
[ ] Remove from translatewiki after deploying the core change
-- [ ] `mw-config/LanguageSettings.php` ([[ https://gerrit.wikimedia.org/r/c/translatewiki/+/1028362 | patch ]])
-- [ ] `mw-config/FallbackSettings.php` ([[ https://gerrit.wikimedia.org/r/c/translatewiki/+/1028362 | patch ]])
[ ] Test language search in UniversalLanguageSelector and fix the search index if needed