- zh_CN labels update (#1485181)

program/localization/zh_CN/labels.inc

@@ -116,6 +116,8 @@ $labels['viewsource'] = '显示邮件源文件';
 $labels['markmessages'] = '标记邮件';
 $labels['markread'] = '已读';
 $labels['markunread'] = '未读';
+$labels['markflagged'] = '已标记';
+$labels['markunflagged'] = '未标记';
 $labels['select'] = '选择';
 $labels['all'] = '全部';
 $labels['none'] = '无';
@@ -198,6 +200,7 @@ $labels['dstactive'] = '夏令时';
 $labels['htmleditor'] = '使用 HTML 编辑器';
 $labels['htmlsignature'] = '使用 HTML 签名';
 $labels['previewpane'] = '显示预览窗口';
+$labels['skin'] = '界面皮肤';
 $labels['logoutclear'] = '退出时清空回收站';
 $labels['logoutcompact'] = '退出时压缩收件箱';
 $labels['uisettings'] = '用户界面';