BP or bb language files? BuddyPress forums

I am running latest versions of WordPress, BuddyPress, and bbPress was installed via BuddyPress for group forums.

If I want to translate text strings (still English, just change wording and stuff) for group forums (through bbPress via BuddyPress), do I need to use the bbPress .po (translation) or BuddyPress .po (translation) file? Not sure about this, so thought I would check with some WordPress expertise.

Respond as soon as possible. All help is appreciated.