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

[Wil Clouser]

Wil Clouser <clouserw at gmail.com> added the comment:

Yes.  You can see an in-production implementation at http://github.com/clouserw/tower/blob/master/tower/__init__.py#L51 (I'm overriding ugettext to support an optional context).

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