[docs] [issue31812] Document PEP 545 (documentation translation) in What's New in Python 3.7

[Roundup Robot]

Change by Roundup Robot <devnull at psf.upfronthosting.co.za>:


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keywords: +patch
pull_requests: +4034
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31812>
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