Since it's Easter....

Dutch:
"Vrolijk Pasen" (Happy Easter) if you're secular.
"Zalig Pasen" (Blessed Easter) if you are religious or want to poke fun at the Pope.

Kellemes Húsvétot (in Hungarian), the Húsvét+ (bit of it) which, interestingly enough, and "logically enough", kind of literally means +the Taking (on) of meat ....

I know Easter in English refers to the pre-Christian tradition names, but somehow, I like the Hungarian literal naming of what Easter is all about (end of Lent).

German: Frohe Ostern
Swahili: Pasaka njema

In Spanish, Felices Pascuas.

In Russian, the greeting is not "Happy Easter," but "Christ is risen!" to which the response is something like "Truly, He is risen!"

Edited by NorthAmerican, who can't remember the Russian response in Russian.

Swedish: Glad påsk

Greek is like NA's Russian.

Christos aneste/Alethos aneste.

"Veselo Veliko noč" in Slovenian.

who can't remember the Russian response in Russian.

The response to "Христос воскрес!" is "Воистину воскрес!"

Norwegian: God påske