Update django.po

[mikkelpetersen]

Updated translation for Danish.

All Changes

• [ ] Add an entry to the docs/changelog.rst describing the change.

• [ ] Add an entry for your name in the docs/authors.rst file if it's not already there.

[claudep]

Please, update the translations on Transifex directly: https://explore.transifex.com/django/django-localflavor/