Thank you kenanoff
This solution is working.
System: OpenSuse 10.3 x86_64 PHP 5.2.4
If someone don’t understand, you must fix gettext.php file and localisation should work on x86_64 system(wp 2.3.1).
wp-includes/gettext.php:122
$this->BYTEORDER = 0;
// $this->error = 1; // not MO file
// return false;
