[zh_CN] make corrections/improvements and wrap lines at column 80 in /zh/contributing/*.rst
[zh_CN] small improvement in /zh/installation/url-rewriting.rst
[zh_CN] done /zh/installation/advanced-installation.rst
Merge pull request #1782 from blackpuppy/zh

[zh_CN] done /zh/installation/advanced-installation.rst
[3.0] [pt] Update installation.rst

Full translation.
Merge pull request #1784 from andtxr/patch-2

[3.0] [pt] Update installation.rst
Revert "[3.0] [pt] Update installation.rst"
Merge pull request #1788 from andtxr/revert-1784-patch-2

Revert "[3.0] [pt] Update installation.rst"
[fr] typos