/usr/lib/python2.7/dist-packages/mptt/locale/pl/LC_MESSAGES/django.po is in python-django-mptt 0.6.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/mptt/locale/pl/LC_MESSAGES/../../../../../../../share/pyshared/mptt/locale/pl/LC_MESSAGES/django.po