We do have customization on some buddypress templates that is why other part translation on buddypress pot file wont work. Please translate it on Pro instead. Check this detailed translation guide. Open the pro.pot file from this location: \wp-content\themes\pro\framework\lang. Check the words you need to translate from that pot file and follow the guide.
If you have still issue after this, we might need to check your setup. Please setup a staging site that we can access so we can see your settings. Hope this helps.