BuddyPress.org

I had similar problems with translating, then I figure it out what I did wrong. You should uploaded these files to server:

1. /wp-content/mu-plugins/bp-languages/

– file: buddypress-***.mo

2. /wp-includes/languages/

– file: ***.mo

*** is the name of your language (etc. for Slovenian language: sl_SI)

I hope this helps