Hi
Take a look at wp-config.php in the root directory.
You should add a line that looks like this:
define (‘WPLANG’, ‘it_IT’);
The part that says “it_IT” has to match your theme’s MO file postfix (e.g. precious-it_IT.mo).
If the line says:
define (‘WPLANG’, ”);
then WordPress is set to English and it won’t look for any translation file.
I hope it helps!
Thank You