Show error on upload

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36744 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4559: rotate tool error message

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36745 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e