This is more of a WordPress issue than bbPress, bbPress should function in whataver language the site is in correctly.
This looks like a good start and quite a few people use WPML and bbPress
http://stackoverflow.com/questions/14949631/wordpress-multisite-multiple-languages
https://bbpress.org/forums/search/wpml/
Oh BTW… WPML has an extra plugin to make it compatible with bbPress but no public download link, you need to ask them for this, why? I do not know you just do :/
Hi,
I’m currently struggling with bbpress/wpml and my experience so far:
It works, using the unofficial wmpl-bbpress plugin – for 85%
Each language have their own forums.
Modifying the plugin (adding hooks for registration + lost password page) it works for 90% and I’m pretty shure that the rest of the issues with language switching can be solved…
.. till yo begin to add bbpress plugins:
working: GD bbPress Attachments, GD bbPress Tools, bbP Topic Views
not working so far: mark as read, bbPress Unread Posts
However, its unstable.
Sometimes – on very rare occasions – topics appear on the wrong language fork.
From WPML.org there is no serious help – just search their forums and get the picture how they handle this issues.
You may take a look at my test installation at http://new.openandromaps.org/ , it will stay online for some weeks.
I, by myself will probably set up a subdomain for the forum with ONE forum for all languages with sub_forums for the language forks.
Best regards
Christan