How do you load the text domain? The theme itself does not contain any load_theme_textdomain. Did you write it yourself? If yes could you explain what you did?
Moreover, I noticed that the theme uses different text domains depending on the file. Examples:
in theme_admin.php:
_e( 'Proyecto Theme' ) -> default textdomain
_e( 'Favicon', 'proyecto' ) -> proyecto texdomain
in index.php:
_e('Recent Projects','fotos') -> fotos texdomain
Only one theme domain 'proyecto' should be used.