Refined changes to Polish localization format file made in r13298 and r13327...

Refined changes to Polish localization format file made in r13298 and r13327 by using non-breaking space. Refs #13577.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15843 bcc190cf-cafb-0310-a4f2-bffc1f526a37