Something that I have ran into is the mono runtime for gaming, it has many complicated dependinces which can easily conflict with the main system. I just ended up making full containers for older mono versions to get old games to work anyways.
Oh, yeah I guess that would be an instance admin thing cause mine has a whole bunch in that settings box. Let them know that “undetermined” needs to be included as an selectable language.
On the web interface, go to your account settings and out of all the languages selected; ensure that “undefined” is one of them. You can select multiple languages by holding down the “control” key and clicking. For example, right now I have both “english” and “undefined” as the languages I use.
Theres also misskey, calckey, and plemora