This is important in the future for me. Right now, I have a few forums which have a Spanish and Russian category and another site for my forum but in French.
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Serve your users. What languages do they speak / understand? Cater for those languages first.
Languages is about power politics first, then ease.
Ask yourself, what will this language be associated with today and in the future?
Have you considered having a forum that has a “Request a language” section?
Which language do you use for the title, though?