I have used poedit to translate the default.po, save it

I have used poedit to translate the default.po, save it as es_ES.po and generated the es_ES.mo

I have uploaded es_ES.mo to wp-content/plugins/pro-sites/pro-sites-files/languages/ folder.

I have set WPLANG variable in wp-config.php file to es_ES

Still I see everything in English, what am I missing?

regards,

Guillermo.