Adding log entries with non-ascii characters crashes page

[jmbredal]

Internal Server Error: /seeddb/room/
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 111, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/lib/python2.7/dist-packages/nav/web/seeddb/page/room.py", line 53, in room
    delete_view=room_delete)
  File "/usr/lib/python2.7/dist-packages/nav/web/seeddb/page/__init__.py", line 53, in view_switcher
    return delete_view(request)
  File "/usr/lib/python2.7/dist-packages/nav/web/seeddb/page/room.py", line 80, in room_delete
    extra_context=info.template_context)
  File "/usr/lib/python2.7/dist-packages/nav/web/seeddb/utils/delete.py", line 105, in render_delete
    log_deleted(request.account, objects, template='{actor} deleted {object}')
  File "/usr/lib/python2.7/dist-packages/nav/web/seeddb/utils/delete.py", line 124, in log_deleted
    LogEntry.add_delete_entry(account, obj, template=template)
  File "/usr/lib/python2.7/dist-packages/nav/auditlog/models.py", line 113, in add_delete_entry
    object=obj
  File "/usr/lib/python2.7/dist-packages/nav/auditlog/models.py", line 73, in add_log_entry
    self.summary = template.format(**dict)
UnicodeEncodeError: 'ascii' codec can't encode character u'\xf8' in position 19: ordinal not in range(128)