Fixed #8276 -- Changed the names of a few Polish localflavor classes to match

their common names/acronyms, similar to other localflavors.

Backwards incompatible if you're using these classes.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8345 bcc190cf-cafb-0310-a4f2-bffc1f526a37