Can't change subforum to wiki
When a forum already exists and I want to add it to an existing namespace, I get the message that I first have to configure the namespace. But it's already configured.
Additionally, if I try to add a wiki subforum under the namespace, but its parent forum isn't wiki, I get this message.
Also, if I move a forum to another namespace, or change a non-wiki forum to a wiki forum, the namespace is rebuilt, but not saved.
Fixed for the next build.