app/code/core/Mage/Core/controllers/AjaxController.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Core
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */
class Mage_Core_AjaxController extends Mage_Core_Controller_Front_Action
{
    public function translateAction ()
    {
        if ($translate = $this->getRequest()->getPost('translate')) {
            try {
                if ($area = $this->getRequest()->getPost('area')) {
                    Mage::getDesign()->setArea($area);
                }
                Mage::getModel('core/translate_inline')->processAjaxPost($translate);
                echo "{success:true}";
            }
            catch (Exception $e) {
                echo "{error:true,message:'" . $e->getMessage() . "'}";
            }
        }
        exit();
    }
}

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