[docs] [issue36425] Add Simplified Chinese to the language switcher

[Shengjing Zhu]

New submission from Shengjing Zhu <zsj950618 at gmail.com>:

Just checked on transifex, the Simplified Chinese translation has reached

- 100% of bugs.html
- 100% of tutorial
- 100% of library/functions (builtins)

So, let's add it to the language switcher

{
    'zh-cn': 'Simplified Chinese'
}

And backport it to 3.7 branch.

----------
assignee: docs at python
components: Documentation
messages: 338811
nosy: docs at python, mdk, xiang.zhang, zhsj
priority: normal
severity: normal
status: open
title: Add Simplified Chinese to the language switcher
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36425>
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