If you have nginx or some other reverse proxy in front of NodeBB, you can use that to set the response header.
Localized posts plugin
I would like to make a forum, but I don't really love the idea of dividing it by languages, so I thought about a plugin that can help a user to translate a thread (so the one who writes it can decide to make a 2nd version of the post for example in English if it's not his first language)...
Since I'm not really into node dev, I would like to have some opinions about this idea...
And some technical opinions too (like how to deal with different databases, for example, redis and/or mongo)
(And I hope this is the right section to post)