Fix table formatting in zh translation.
[zh] fix sphinx build error: keep class attribute value for "container" directive in the original text
[zh] follow en update
[zh] add /zh/contents.rst to fix sphinx build warning
Merge pull request #1721 from blackpuppy/zh

[zh] fix sphinx build errors from last pull request #1712
[zh] add /zh/epub-contents.rst to fix sphinx build error
[zh] add /zh/pdf-contents.rst to fix sphinx build error
[zh] fix lang=en error in *contents.rst files
[zh] fix sphinx build warnings about nonexisting document in *contents.rst
[zh] try to fix sphinx warnings in build #1986
Merge pull request #1722 from blackpuppy/zh

[zh] fix sphinx build errors from last pull request #1721
Exclude zh from PDF builds.

We don't have the correct latex packages on the server to build a PDF
version of the zh docs.