[1.0.X] Fixed #8879 -- Used ungettext instead of ngettext in the comments framework.

Patch from zgoda.

Backport of r9116 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@9123 bcc190cf-cafb-0310-a4f2-bffc1f526a37