[MPlayer-translations] sync help_mp-zh_CN.h with help_mp-en.h r21655

[mail at kraymer.de]

> Hi,
>
> This is my first time submit patch for translations, please let me know
> if the patch format/content have any problem.

Patch was fine, thanks. But maybe give it a .diff or .patch file extension
next time.
> BTW, is this correct to attach the patch or should I just copy-paste
> inline?  I will use attachment this time.

Attachment please. Grabbing it from the mail with copy/pasty may lead to
problems and is extra work too.

By the way, there are two other folks working on Chinese translation,
maybe you want to join? The man page is practically complete and could
need a review/small fixes. Also, we just started to create xml
documentation for Simplified Chinese.

Sebastian