Ticket #4080: greek letters are better supported for Java/GeoGebra

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31841 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #4080: some more special symbols that can be supported

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31842 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e