[MPlayer-translations] fix some wordings in help_mp-zh_CN.h

[mail at kraymer.de]

S Jin wrote:
> Index: help_mp-zh_CN.h
> =================================================================== ---
> help_mp-zh_CN.h	(revision 20459)> +++ help_mp-zh_CN.h	(working copy)

Applied (r20495)

-- 
"Man, it's hot! How hot is it? It's so hot, I poured McDonalds
 coffee in my lap to cool off!"  *giggle* "Johnny Carson said it."
                                 --Fry, Futurama (Crimes of the Hot)