Months of discussion at https://www.mediawiki.org/wiki/Talk:Universal_Language_Selector/Compact_Language_Links but the most important thing was forgotten, we've not updated data from CLDR (context: https://www.mediawiki.org/wiki/ULS/FAQ#language-territory )!
Here are the updates on jquery.uls: https://github.com/wikimedia/jquery.uls/pull/249 + 250
Please add {{tracked}} (and close) https://www.mediawiki.org/wiki/Topic:Tkooeue6jnzqr2xd