Comment 1 for bug 1023722

The patch changes behavior in a backwards incompatible way.

In Zope 2 you can have a normal value in the request (or request.form) by the key 'locale'. If you have such a key, the special locale object won't be accessible. We can change this behavior in a new major version like Zope 4 and give the special locale object precedence over normal values. But we cannot do that in a maintenance release.