Can we ask questions in non-English natural languges?
This question was closed recently for not being in English.
Stack Overflow, the largest site, does require questions to be in English, but certain other sites, such as the Mathematics site, do not. Sites about a specific language like French, Spanish, or Mandarin have their own policies, but they're sort of a special case.
In the Mathematics site, questions can be posed in any language and someone will add a translation to the end if the question wasn't originally in English. The consensus seems to be that answers can be in English or in the language the asker used, with English being preferable. I'm not totally sure about the policy for answers on the Mathematics site.
I don't know whether relatively new sites like this one can choose to adopt a rule that's more inclusive of non-English languages, but it might be worth considering.