BuddyPress Multilingual plugin by ICanLocalize and jozik allows visitors to choose their language. It makes all the BuddyPress elements multilingual including the main site and all guest sites.
Guest blogs can choose their language and create multilingual contents. Additionally, each guest can choose the admin language individually.
This plugin requires WPML. It uses WPML’s language API and hooks to BuddyPress to make it multilingual.
Requirements:
WPML 1.7.3 or higher. You must enable ‘languages per directories’.
Supports BuddyPress versions up to 1.2.
Download: http://wordpress.org/extend/plugins/buddypress-multilingual/