add ngettext support & optimize gettext handling

As I was adding ngettext support, I realized I could optimize the gettext
functions by memoizing the creation of the gettext object. Note that
the object creation is still deferred until a gettext function is called,
to avoid unnecessary startup penalties on code paths that do not need
gettext.

A side benefit is that separate stub functions are no longer needed to
handle the C language case.

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