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Explanation: Congratulations is translated to "omedetougozaimasu" or "omedetou"
Since the greeting is addressed to newlyweds, I added "gokekkon" and "gokekkon omedetougozaimasu" means "congratulations on your marriage". "omedetou" or "omedetougozaimasu" is normally used to congratulate
marriage, "gokekkon omedetougozaimasu"
graduation, "gosotsugyou omedetougozaimasu"
new job, "goshushoku omedetougozaimasu"
new house, "shinchiku omedetougozaimasu"
"Omedetougozaimasu" is also used to express "a Happy New Year" on New Year's day or when you greet somebody during the month of January.