Add zh-rCN Translation

【framework-res strings】Add Chinese Simplified Translation ------噱·头
Rename biantai_strings to biantai_strings.xml
Two-line layout for status bar date

通知栏日期双行样式
Add a standalone file manager

Add a standalone mode to the DocumentsUI
to let it act as a file manager/explorer.

添加独立文件管理器

添加DocumentsUI的独立模式,
从而让他像一个普通的文件管理器一样运行.
Prevent lock/unlock sound during music playback

Lock/unlock sound mixes in with music and causes
lag and distortion.

在播放音乐时阻止播放锁屏/解锁声音

锁屏/解锁声音和音乐混在一起会造成卡顿和失真.