[1.1.X] Fixed #12613 -- Added Q and Z to the list of characters supported by...

[1.1.X] Fixed #12613 -- Added Q and Z to the list of characters supported by the phone2numeric filter. Thanks to gabrielhurley for the report and patch.

Backport of r12425 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12427 bcc190cf-cafb-0310-a4f2-bffc1f526a37