[issue18217] Deprecate and remove gettext.install

[Éric Araujo]

Éric Araujo added the comment:

> The doc for NullTranslations.install needs the erroneous '()'s removed to make clear
> that the bindings are to bound methods and not the result of calls to bound methods.
> Ie, self.gettest() should be just self.gettext.

The source contains :meth:`self.gettext`, and Sphinx adds the parentheses when creating markup for a function, probably because it’s common to say things like “the len() function”.  There is a Sphinx config value to control that.  If one wants to keep the parens for most functions but not have them in a few cases, other markup than :meth:/:func: has to be used.

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versions: +Python 3.5 -Python 3.4

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<http://bugs.python.org/issue18217>
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