Multi Language

I wonder if it is possible to use Blogs-MU as a multi language BuddyPress Intallation.

I am still researching language plugin switcher, but there are many issues I can think of, which I need to understand.

1. Even if I do find the a good language switcher plugin, there is still the Blogs MU Theme Options, which does not seems to support multi-language. Any solution to that?
2. When I use language switcher, how do I make sure that all the language files are switched (theme, BuddyPress, bbPress. etc)?
3. Any recommendation for a good Language switcher plugin?