//Steps to reproduce//:
# Open any Wikipedia main page (e.g. Indonesian Wikipedia)
# Look at the language selector on the left side of the page
# Find the Sundanese Wikipedia and you will see language name on the selector is "Basa Sunda"
//Actual result//:
The language's name on the selector is written "Basa Sunda"
//Expected result//:
The language's name should be written "Sunda" only, based on [[ https://su.wikipedia.org/wiki/Wikipedia:Sawala_(t%C3%A9knis)#Wikip%C3%A9dia_basa_Sunda_atawa_Wikip%C3%A9dia_Sunda? | a community consensus ]] on Sundanese Wikipedia's village pump. This also applies to the language selector on top of page, next to the username.
There are very similar tasks on autonomic changes in the past: [[ https://gerrit.wikimedia.org/r/c/mediawiki/core/+/521199/ | this ]] and [[ https://gerrit.wikimedia.org/r/c/mediawiki/core/+/505391 | this ]].