ENHANCEMENT Changed tree root node in CMS to get title from SiteConfig rather than defaulting to "Site Content"
ENHANCEMENT Changed tree panel headline in CMS from "Site Content and Structure" to "Page Tree" to stay consistent with new CMS menu title
git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/cms/branches/2.4@97597 467b73ca-7a2a-4603-9d3b-597d59a354a9