1.1.3dev: improve layout of wiki page create form

First make clear which page we're talking about,
then propose the "Create this page" button,
and only then follow by a list of alternate links
(higher in the hierarchy, or like before, similarly
named pages).

Closes #11836.


git-svn-id: http://trac.edgewall.org/intertrac/log:/trunk@13358 af82e41b-90c4-0310-8c96-b1721e28e2e2