JForum2 has been localized to a number of languages, namely
but unfortunately some of those localizations are rather out of date - new features have been added, and for those only a few translations are available. Some languages are in good shape (de_DE, en_US, it_IT, zh_CN and zh_TW), but the others are in need of volunteers that can look through what's missing and help us out with translations.
So if anybody out there is fluent in one of these languages, and would like to help out the JForum2 team, please post here, or get in touch via PM. I can provide a list of missing texts for each language to make it easier to get started.
Many thanks in advance!
The JForum2 team