In another context I thought about the possibility for links in foreign languages as long as they are marked, and maybe summarized by a sentence to help people get the context. I think in todays time with browser being able to translate, that should be a feasible approach. I didn't find time to debate that with the other mods, yet.
To me, coming from a moderation perspective, the idea of whole discussions in a plentitude of languages is problematic. In my opinion, we would need to have more mods being able to at least police content if need be.