Here's what I got from Free Translation.com on the English phrase
"Have a happy 5TH of May. May your parties include beer and lime juice."
(if you notice the Spanish phrase "Cinco de Mayo" didn't appear at all in the computer generated translation)
Tenga un 5 feliz de mayo. Puede sus partidos incluyen cerveza y jugo de lima.
(although I may be a bit pretentious .... I have to remember that Spanish and English are dyslexic opposites)