Regardless of which language is selected, the "Priority updates" is always in the same language.
Comments 3
It's not a bug; the languages need to be downloaded to mojang's server; this isn't done the moment they're translated, nor the moment a snapshot is released; only later on in development of 1.18.
This is how it always has been done.
Invalid, translations are made by the community on crowdin; they'll be downloaded later on. (Translations aren't pushed to crowdin before the snapshot releases)