[1.2.X] Fixed #14669 -- corrected an ungrammatical sentence in the...

[1.2.X] Fixed #14669 -- corrected an ungrammatical sentence in the internationalization docs. Thanks to steveire for the report.

Backport of [14539] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14540 bcc190cf-cafb-0310-a4f2-bffc1f526a37