[issue4391] optparse: use proper gettext plurals forms

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

optparse is widely used, so the answer to my question is: yes, it is worth fixing.  Checking argparse for the same errors is also a good idea.

Dwayne: can you update your patch to address my remarks?  If not, someone else or I may do it.  Adding the “easy” keyword for potential bug-day contributors.

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keywords: +easy

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