[issue4391] use proper gettext plurals forms in argparse and optparse

[Éric Araujo]

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

Georg approved my patch for the beta1.  Steven, since you approved my other gettext-related changes, we thing it’s okay if I don’t wait for your +1.

For optparse, I will review the changes later.

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assignee:  -> eric.araujo

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4391>
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