wordpress - Buddypress: Language not changing -

i'm getting crazy because seems fine, impossible solution.

i want translate buddypress spanish.

seems have ok:

my language files:

my wp-config

define('wplang', 'es_es');

my config on dashboard: setted spanish

my wordpress version : 4.1.

my wordpress translated ok once set language on dashboard, anyway buddypress language not change.

any idea wrong here??

you need create , upload buddypress-es_es.mo file. .po files used create .mo file. don't need upload .po files.