I had a question about learning modern (spoken) Greek, and my first attempt was to look for https://greek.stackexchange.com, but there is no such real site (now). After some digging, I found https://languagelearning.stackexchange.com, where I asked my question.
Would it make sense to have the catchall *.stackexchange.com site where names of languages (perhaps this list could be limited to languages mentioned on meta.SE), instead of saying e.g. "Couldn't find greek.stackexhange.com", instead say something like "There is presently no standalone greek.stackexchange.com site. You may be interested in languagelearning.stackexchange.com."?
By the way, I noticed that (on my high-resolution laptop screen) on meta.SE, ll.SE is buried in the next to last row. If that site serves as a catchall for all languages that presently have no dedicated SE site, perhaps it could be more prominently mentioned, possibly with some description that would say "Some languages, including [list of languages], have their own dedicated sites and are the preferred sites for questions about learning and teaching those languages" or the like?