A few action=info bugfixes and enhancements.
(bug 39533) Merge action=credits into action=info.
(bug 39951) Remove redundant 'Page protection' text.
(bug 39953) Don't show irrelevant protection statuses.
(bug 39954) Use proper section headers.
(bug 39955) Link page creator and latest editor values.
Change-Id: I68308aac96b89c2aec296e2a4fa385fd1d42ab5a