DOCS/xml/zh_CN: replace usage.xml symlink to English with copy
Remove usage.xml symlink in the Chinese documentation translation.
It will be replaced with the English text in a moment.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@31965 b3059339-0415-0410-9bf9-f77b7e298cf2
Add copy of English usage.xml file to Chinese translation.
This will be useful to merge other parts of the Chinese translation into it.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@31966 b3059339-0415-0410-9bf9-f77b7e298cf2