Wrong parameter lookup in POST querydict of _handle_cancel

[theju]

The POST querydict does not get '_cancel' as a key in _handle_cancel but the key is 'submit' and value is '_cancel'. Due to this clicking on cancel on a form won't work (this is just one of the reasons, there is another reason which would require another topic to be opened).

Check http://github.com/theju/django-frontendadmin/commit/9768d968651c1237cf5def579d524eb926e4e5b8

[olethanh]

The problem is that in ajax mode this is 'submit' == '_cancel' and in non-ajax mode there is a '_cancel' key in the get dict