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

[Shengjing Zhu]

Change by Shengjing Zhu <zsj950618 at gmail.com>:


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keywords: +patch
pull_requests: +12487
stage:  -> patch review

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