I just checked, the language settings of this community are set as such:

My account settings are set like this:

Would it be possible to automatically match the post settings with the languages allowed by the community?

Would it be possible to have the language tag visible directly in the UI?

Also, I've always been cautious with using language tags due to the history of language settings being set incorrectly at the user level in Lemmy (see !languagesettings@lemmy.zip )

A large number of the German speaking communities do not set it automatically to German either, and their expectation is probably that if someone does not speak German, they are going to just block that community once and be done with it.