[zh_CN] follow en changes

Conflicts:
	zh/pdf-contents.rst
[zh_CN] follow en changes
[zh_CN] done /zh/core-libraries/toc-behaviors.rst

also update /zh/models/behaviors.rst accordingly
but :start-line: is inconsistent across en and zh_CN
Merge pull request #2083 from blackpuppy/zh

[zh_CN] done /zh/core-libraries/toc-behaviors.rst