Language settings not working since apache2 & php5 upgrade

Recently, Bluehost upgraded my server to apache 2 and php 5. Since they did it, my language settings for WordPress and the template are not working.

I’ve checked all settings. Here you have my wp-config.php:

<?php
// ** MySQL settings ** //
define(‘DB_NAME’, ‘xxxxxxx_wrdp’); // The name of the database
define(‘DB_USER’, ‘xxxxxxx_wrdp’); // Your MySQL username
define(‘DB_PASSWORD’, ‘xxxxxxxxxxxxx’); // …and password
define(‘DB_HOST’, ‘localhost’); // 99% chance you won’t need to change this value
define(‘DB_CHARSET’, ‘utf8’);
define(‘DB_COLLATE’, ”);

// You can have multiple installations in one database if you give each a unique prefix
$table_prefix = ‘wp_’; // Only numbers, letters, and underscores please!

// Change this to localize WordPress. A corresponding MO file for the
// chosen language must be installed to wp-content/languages.
// For example, install de.mo to wp-content/languages and set WPLANG to ‘de’
// to enable German language support.
define (‘WPLANG’, ‘es_ES’);

/* That’s all, stop editing! Happy blogging. */

define(‘ABSPATH’, dirname(__FILE__).’/’);
require_once(ABSPATH.’wp-settings.php’);
?>

*.mo files are in the correct folders.

And if I install the blog in a local server, language settings work fine. The same files and DB in Bluehost doesn’t work.

They have no idea about how to solve the problem. Me neither. Could anyone give me a clue?

Thanks and sorry for my english.