These statistics are not accurate: http://translate.fedoraproject.org/languages/pl/fedora-8 anaconda, libvirt, setroubleshoot, system-config-services, virt-manager and homepage are in fact 100% translated. system-config-printer has only one empty string. Real statistics can be found here: http://i18n.redhat.com/cgi-bin/i18n-status
I believe it is fixed now. Please report back if any modules still have broken stats. Note that DL doesn't automatically merge POT changes into PO files, so better compare the stats with your checked-out copy instead of i18n.redhat.com.