Imposible to set to spanish language

Hello.
I dont know what i am doing wrong to set my wordpress to spanish language.
I am going crazy…
I copy the file es_ES.mo for 2.3.2 version in /var/www/wordpress/wp-content/languages
I change in my wp-config.php:
define (‘WPLANG’, ”);
to:
define (‘WPLANG’, ‘es_ES’);

And nothing happens 🙁 it is still in english
The admin site still ALL in english

Please help me
What i am doing worng?

Thank you very much.