Problems translating website

Hi there,
I need some help !

We already translated our wordpress to pt_br: downloaded pt_br.po and pt_br.mo, uploaded that to language folder and already set the wp-config. That's ok !

Then we downloaded the buddypress-pt_BR.mo and buddypress-pt_BR.po here: http://i18n.svn.buddypress.org/pt_BR/trunk/
I upladed that to /wp-content/plugins/buddypress/bp-languages

But it doesn't worked... There are still a lot of stuff not translated in our website...

I tryed to rename that files to en_EN and uploaded to /wp-content/themes/bp-social/languages

But still doesn't worked...

Can someone help us please ?
Thank you very much
Rodrigo