Depends what you mean by that.
internationalisation (having the game in multiple languages so the user can choose one) - not worth it, one language group will dominate the game communication making the game unplayable for other players (try playing an English/Spanish language game on a game dominated by Spanish players and you will see what I mean).
localisation (having multiple separate games with different languages, usually via subdomain) - might be worth it, assuming you have access to the target language players. Be aware of "multibyte languages" (mostly Asia I think), you will have to rewrite some basic string manipulation functions and change database structure in worst case scenario.
I do not believe internationalisation would work in BBG, I have only seen one successful example, it is Reversi on Windows (where you have predefined full sentences you send to other players). On the other hand there are plenty successfully localised games.