Depends on your value preposition, 

There isn't a right way to do something, you need to understand your users, behaviors, pain e needs.

 - Does your plataform have a different kind of user? 
 - How do they feel when see a question in another idiom?
 - Would they like see a question in native idiom? 
 - When user interact, should us translate the awser to?

It's more about your businnes and your users!