fix #8919 - fix memory leaks, including one introduced with r5982

git-svn-id: http://josm.openstreetmap.de/svn/trunk@6107 0c6e7542-c601-0410-84e7-c038aed88b3b
fix #8912 - language command line option evaluated too late

git-svn-id: http://josm.openstreetmap.de/svn/trunk@6108 0c6e7542-c601-0410-84e7-c038aed88b3b
Merge branch 'master' into mirror