Since it's Easter....

You need an "h" there: "ha-Meshiach qam!"

Pretty useful expression indeed.

In cantonese - fuhk wuht jit faai lohk

In Mandarin - fù huó jié kuài lè

#20 -- Bad copying and pasting on my part. Thanks.

French: Joyeuses Pâques.
Russian: Христос Воскресе! Answer : Воистину Воскресе!
Easter in many languages: http://forum.lokanova.net/viewtopic.php?f=23&t=8083

This response is a bit belated but:
Italian:buona pasqua
Indonesian: Selamat hari paska

for us orthodox (except finnish orthodox) easter is today.
and in serbian its like in russian (the greeting is universally orthodox):
Hristos voskrese! (Christ is risen)
Vaistinu voskrese! (Indeed he is risen)

but we can also say (to non-Orthodox) "Srecan Uskrs" (Happy Easter). (the "c" in srecan is this specific serbo-croatian letter with a little accent over it and its pronnounced as if youre trying to pronounce "tj" ("ty" for english speakers) in one breath.