Update zh_CN, thanks to walle

language/zh_CN/whats_new_16.lang.php

@@ -0,0 +1,10 @@
+<?php
+// +-----------------------------------------------------------------------+
+// | This file is part of Piwigo.                                          |
+// |                                                                       |
+// | For copyright and license information, please view the COPYING.txt    |
+// | file that was distributed with this source code.                      |
+// +-----------------------------------------------------------------------+
+$lang['Brand new login & preferences with Standard pages !'] = '全新登录界面与标准页面设置选项！';
+$lang['Two factor authentication is here'] = '两步验证功能现已上线';
+$lang['UI redesigns that make a difference'] = '用户界面（UI）的重新设计，使其焕然一新';