Happy holidays, felices fiestas, اجازة سعيدة, Selamat berlibur, 節日快樂, sretni praznici, frohe feiertage, ευχάριστες διακoπές, חג שמח, bonne fêtes, buone vacanze, खुश छुट्टियाँ, 幸せな休日, fijne feestdagen, 행복한 휴일, masaya pista opisyal maligayang kapistahan, Wesołych świąt, boas festas, cчacтливыx пpaздникoв, sărbători fericite, glædelig ferie, lykkelig ferie, glada helgdagar, iyi tatiller, ...
Note: I may have screwed-up on a few though.
Edit: @jonemil24, I'll take your word over Google's for it ...
Yup , you screwed. Happy holidays literally translate to खुश छुट्टियाँ but nobody use this term.
General practice will be say like छुट्टियाँ मुबारक or शुभ छुट्टियाँ .