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

[INADA Naoki]

INADA Naoki added the comment:

Ah, I misunderstood your comment is about Sphinx's internal DOM.

Sphinx has own pot and po files.

In case of custom extension, `sphinx-build -b gettext` doesn't extract
messages from Python code. That's why I used dummy html template.

Another way is adding custom make target, which runs `sphinx-build -b gettext`
and custom command to generate another pot from pyspecific extension.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28331>
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