Attached patch fixes the two misuses I found in argparse.

I tried importing ngettext as _ngettext to comply with arpgarse’s crazy^Wpersonal <wink> import style (enforced in TestImportStar), but then I could not force xgettext to find all the strings.  Rather than struggle longer with the program, I chose to add an exception for ngettext in the test.  “from argparse import *” does not import ngettext, thanks to __all__, so I think my choice is simple and sensible.