luos/workflow/engine/methods/setup/loginSettingsAjax.php

<?php
 $request = isset($_REQUEST['request'])? $_REQUEST['request'] : null ;
  
  switch($request){
    case 'getLangList': 

      $Translations = G::getModel('Translation');
      $result = new stdClass();
      $result->rows = Array();
      
      $langs = $Translations->getTranslationEnvironments();
      foreach($langs as $lang){
        $result->rows[] = Array('LAN_ID'=>$lang['LOCALE'], 'LAN_NAME'=>$lang['LANGUAGE']);
      }
      
      print(G::json_encode($result));
      break;

    case 'saveSettings':
      $memcache = & PMmemcached::getSingleton(defined('SYS_SYS') ? SYS_SYS : '');
      G::LoadClass('configuration');
      $conf = new Configurations;
      $conf->loadConfig($obj, 'ENVIRONMENT_SETTINGS','');

      $conf->aConfig['login_enableForgotPassword']  = isset($_REQUEST['forgotPasswd']);
      $conf->aConfig['login_enableVirtualKeyboard'] = isset($_REQUEST['virtualKeyboad']);
      $conf->aConfig['login_defaultLanguage']       = isset($_REQUEST['lang'])? $_REQUEST['lang'] : 'en';

      $conf->saveConfig('ENVIRONMENT_SETTINGS', '');
      
      //remove from memcache when this value is updated/created
      $memcache->delete('flagForgotPassword') ;
      
      $response->success = true;
      echo G::json_encode($response);

      break;
  }