Like WordPress, BuddyPress has the built in capability to be used in any language.
Above is a list of all currently availiable BuddyPress language translation files. If you do not see your language in the list, please consider creating a translation file. For instructions, please take a look at Translating WordPress as many of the instructions there can be applied to BuddyPress.
You can find the latest BuddyPress PO file here: http://svn.buddypress.org/trunk/bp-languages/buddypress.pot or in /bp-languages/ in a BuddyPress trunk check out.
