static function activate()
 {
     try {
         self::$charset_collate = self::build_charset_collate();
         self::build_icl_string_packages_table();
         self::fix_icl_string_packages_ID_column();
         self::build_icl_strings_columns();
     } catch (Exception $e) {
         trigger_error($e->getMessage(), E_USER_ERROR);
         exit;
     }
 }