Changing javagiac.dll's to the latest version in desktop/kickstart.xml

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37773 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Changing giac.js to the latest version in web/kickstart.xml

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37774 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Refactoring of LanguageGUI (split long method)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37775 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e