Two or three languages discourse

It boils down to which you prefer. Using the same instance, you can

  1. Create individual categories that are language-specific as you’ve described, or
  2. Use the set locale from accept language header site setting to have to your users register on the site with the locale their browser is set to.

I see you already asked a question over at How to structure a multilingual community - #34 by Yves_Lauzin, so no need to mention that post again.

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