Translate a website with Directory plugin

Hello,

I want to translate a website using Directory, buddypress and BuddyPress Default theme.
What files do I translate? I have:

/ www / wp-content / languages
/ www / wp-content / plugins / directory / languages
/ www / wp-content / plugins / directory / themes / default / languages
/ www / wp-content / plugins / buddypress / bp-languages

Are there files ".po" already translated in french?

Thanks