While doublechecking on Happy Easter in Gaelick I've come to a site called Omniglot.

Here are some results for Happy Easter:

Hebrew - (chag pascha same'ach)  חג פסחא שמח

Greek - Καλὸ Πάσχα  (Kaló Páskha)

Latin - Prospera Pascha sit

Esperant - Feliĉan Paskon

And here is the rest

It is interesting to see how some of the words relate to "original" Passover and others to the word East.


While at it I also stumbled on the phrase  "It's all Greek to me" in Greek  ::)