Update tube user language when changed in app

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36231 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fixed path for language cookie

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36232 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e