ниже добавляем
include_once ROOT_DIR.'/language/'.$config['langs'].'/website.lng';

файл engine/engine.php
if ($config['speedbar']) include_once (ENGINE_DIR.'/modules/navigation.php');

заменяем на
if ($config['speedbar'] AND $view_template == "") include_once (ENGINE_DIR.'/modules/navigation.php');

файл/language/Russian/website.lng
в самом конце перед
?>

поставьте
$langdateshortweekdays = array("Вс","Пн","Вт","Ср","Чт","Пт","Сб");

файл engine/init.php
$_REQUEST['skin_name'] = end (explode (DIRECTORY_SEPARATOR, $_REQUEST['skin_name']));
if (@is_dir(ROOT_DIR.'/templates/'.$_REQUEST['skin_name']))

заменить на
$_REQUEST['skin_name'] = trim(end (explode (DIRECTORY_SEPARATOR, $_REQUEST['skin_name'])));
if (@is_dir(ROOT_DIR.'/templates/'.$_REQUEST['skin_name']) AND $_REQUEST['skin_name'] != '')