[issue2504] Add gettext.pgettext() and variants support

[Antti Haapala]

Antti Haapala added the comment:

*wow* isn't this in Python 3 yet (I've been using Zope translationstrings lately so I didn't know that pgettext is still not supported).

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nosy: +ztane

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue2504>
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