What's the URL of the page containing the problem?
/account/register/, but probably others
What steps will reproduce the problem?
Install a newer version of Django
http://code.djangoproject.com/wiki/BackwardsIncompatibleChanges#Newforms:clean_datachangedtocleaned_data
What is the expected output? What do you see instead?
Get a Python error when posting that form instead of the account created page.
Please provide any additional information below.
I think you'll need to change clean_data to cleaned_data in
./djblets/auth/views.py
./accounts/views.py
./diffviewer/forms.py
./reviews/forms.py
