Fix broken display of custom admin views

The parameter order changed in the function we use for registering
custom views with admin plus. Since we updated django-adminplus, which
we use for the custom views, along the Django 1.6 update, we were
affected by this change. This commit fixes the registering of our custom
views to conform to the new signature.
Fix more url tags in different Django templates

These definitions were wrong due to a deprecated feature in Django
1.5. All url tags that refer to a named url are now required to be
quoted. Otherwise, they are interpreted as a context variable.

The templates fixed by this commit should be the last ones.