fix #8685 - wiki browser links not working

git-svn-id: http://josm.openstreetmap.de/svn/trunk@5936 0c6e7542-c601-0410-84e7-c038aed88b3b
fix #8685 - wiki browser fix external links (althought they look very ugly)

git-svn-id: http://josm.openstreetmap.de/svn/trunk@5937 0c6e7542-c601-0410-84e7-c038aed88b3b