Index: branches/5.2.x/core/units/helpers/user_helper.php
===================================================================
diff -u -N -r15137 -r15176
--- branches/5.2.x/core/units/helpers/user_helper.php	(.../user_helper.php)	(revision 15137)
+++ branches/5.2.x/core/units/helpers/user_helper.php	(.../user_helper.php)	(revision 15176)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: user_helper.php 15137 2012-03-04 08:06:21Z alex $
+* @version	$Id: user_helper.php 15176 2012-03-12 11:39:04Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -363,6 +363,13 @@
 		 */
 		protected function _processInterfaceLanguage()
 		{
+			if ( defined('IS_INSTALL') && IS_INSTALL ) {
+				$this->event->SetRedirectParam('m_lang', 1); // data
+				$this->Application->Session->SetField('Language', 1); // interface
+
+				return;
+			}
+
 			$language_field = $this->Application->isAdmin ? 'AdminLanguage' : 'FrontLanguage';
 			$primary_language_field = $this->Application->isAdmin ? 'AdminInterfaceLang' : 'PrimaryLang';
 			$is_root = $this->Application->RecallVar('user_id') == USER_ROOT;