split files playback support

Hi Andreas,
This request contains 2 parts:
1. the normal zh_CN translation update.
I have one question here: What the difference of item "Power off" and "Suspend"? It seems the one shown in context menu which shuts down PS3 is "Suspend", not "Power off" as I expected.
2. support the playback of split video files to overcome the FAT 4g limitation, especially useful for PS3.
The supported split files can be generated by ffsj or other file split tools: extension should be xxx.001, xxx.002 etc. The split files are shown as one in Showtime file browser like they are not split. I've tested my code and at least it worked. Since I'm not very good at c programming(haven't touched it for more than 10 years), pls feel free to optimize it!