Alien Language 2 has been broken: the chat-room door message reads 'CODEBREAKERS CHAT ROOM', and the columns marked 'YUMMY' and 'TUMMY' in AL1 read the same things in AL2.
For more information check out the Futurama Outlet 'Futurama Alien Alphabet' message board at:
http://www.futuramaoutlet.com/cgi-bin/dcforum/dcboard.cgi
Willie