zentao/extension/xuan/dev/ext/lang/en/xuanxuan.php

<?php
$lang->dev->groupList['xuanxuan']= 'Chat';

$lang->dev->tableList['im_chatuser']         = 'Chat Users';
$lang->dev->tableList['im_message']          = 'Chat Message';
$lang->dev->tableList['im_messagestatus']    = 'Chat Message Status';
$lang->dev->tableList['im_chat']             = 'Chats';
$lang->dev->tableList['im_client']           = 'Chat Client Upgrade';
$lang->dev->tableList['im_conference']       = 'Chat Conference';
$lang->dev->tableList['im_conferenceaction'] = 'Chat Conference Action';
$lang->dev->tableList['im_queue']            = 'Chat Push Queue';