From my experience both are used, but I have not seen any of them used outside of Asia.
no, there is no special greetings but it is for Christmas so you say merry Christmas .
greetings = aloha
Boas festas! (seasons greetings) Felicitações! (greetings)
Well I think it is
Formal greetings= "strasfutie"
Greetings from Germany (English) Grüsse aus Deutschland (German)
greetings of the day
de groeten van mijn vriend. This is the translation of Greetings my friend.
gbiresih
Saudações
Sawerticka
Australians speak english, unless of corse aboriginal. so you would say seasons greetings.