So, I have found a solutions trough reading several subjects and searching here and else…
First, you have to install Codestyling Localization.
Next, in tools > localization, you have to create a translation for buddypress.
If a message pops and says you don’t have the permission to do that ; just transfer the languages files via your ftp in the specified folder.
Then, you will be able to translate all the tabs thanks to Codestyling Localization.
Hope it helps