I like support for lots of different languages. A change that may be quite simple may be to let the user keep some kind of "defaults" for the main languages in used; something a bit like keeping a number that seems reasonable... like, max up to 15 languages or 12 or something like that; and the others could be displayed in a side pane, such as "show more languages" or something like that.
Something like that make sense to me. Most people won't use most of the languages anyway. But showing maybe 5 languages by default (or none), and on that same menu, have an option like "set visible languages", which opens a prefs page that has checkboxes for each language (and that prefs page would be scrollable).