editortoolbar: Treeview revised to make it more readable, and translatable. New Icons for Jump Forward/Jump Back, New Icon for Set Free Bookmark, issue 26557, patch from G. Colla

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46009 4005530d-fff6-0310-9dd1-cebe43e6787f