Well, to be honest, if you want to have a high level discussion about any subject related to computer science, coding, new technology, etc you must be able to speak English, because all high level discussion happen in English.
I think English is probably the major language a lot of the terms related the high level computing exist too (a lot of European higher education institutions seem to teach courses in English - in some cases exclusively).
As the others have said, a lot of local boards don't have many merit sources but a lot don't have many active users either.
I don't know if there's going to be a workaround to level up in the local boards, maybe every so often a user from local boards should post a topic in meta quoting posts of other users on their board they think deserve merit and then another user can merit them if they determine the posts to be of substance (after using translation tools or similar).