Fixed warnings

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23948 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Navigation bar settings not loaded correctly

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23952 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e