[docs] [issue28331] "CPython implementation detail:" is removed when contents is translated

[INADA Naoki]

INADA Naoki added the comment:

Yes.  Actually speaking, this patch is almost copy from VersionChanged directive.
See here:
https://github.com/sphinx-doc/sphinx/blob/master/sphinx/directives/other.py#L216-L221

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<http://bugs.python.org/issue28331>
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