No need for `u` prefix because of the `from __future__ import unicode_literals` line at the top of the file.  Also `u'string'` syntax doesn't work in Python 3.2.

The `unicode` method doesn't exist in Python 3 (it's `str`).  I don't think you need that anyways since `verbose_name` is probably already a unicode string.

These two may be the only Python 3 bugs.