[zh_CN] done /zh/views/themes.rst, /zh/views/media-view.rst and /zh/views/json-and-xml-views.rst
[zh_CN] fix indention error in /zh/views.rst
[zh_CN] replace indention tab with 4 spaces
[zh_CN] done /zh/views/helpers.rst
[zh_CN] done /zh/core-libraries/toc-helpers.rst
Merge pull request #1823 from blackpuppy/zh

[zh_CN] done /zh/views/*.rst