The facebook's language code is not working

Line 448:
$config['connect_js'] = "document.location.protocol + '//connect.facebook.net/$config[language_code]/all.js'";

Should be just before line 458:
$config['loginout_mode'] = variable_get('fbconnect_loginout_mode', 'manual');

Which gives you this result:

$config['app_id'] = variable_get('fbconnect_appid', NULL);
    $config['secret_api_key'] = variable_get('fbconnect_skey', NULL);
    $config['debug'] = variable_get('fbconnect_debug', FALSE);
    
    if (module_exists('i18n')) {
      global $language;
      $switch_code = variable_get('fbconnect_language_code_' . $language->language, '');
      
      if ($switch_code) {
        $config['language_code'] = $switch_code;
      }
    }
    
    $config['connect_js'] = "document.location.protocol + '//connect.facebook.net/$config[language_code]/all.js'";
    $config['loginout_mode'] = variable_get('fbconnect_loginout_mode', 'manual');
    $config['invite_name'] = variable_get('fbconnect_invite_name', variable_get('site_name', $base_url));
    $config['fast_reg_mode'] = variable_get('fbconnect_fast_reg', NULL);
    $config['fast_reg_autoname'] = variable_get('fbconnect_fast_reg_autoname', 1);