It all just depends on what card it is, but normally, it is in small print at the bottom center of the card in the back
look on the back and it will say when it was printed!
Say it back to them. It's a greeting as in what's going on.
The best thing is to say "mazal tov", spelled:!מזל טוב
There are always the hallmark cards. They allow you to say what you want into the card and when your grandmother opens it she will be able to here your voice and listen to your message.
A greeting is der Gruß in German.
Good year in Hebrew! Shalom...Vusumzi Tshatshu Yiftach
say goodbye
If someone simply feels like greeting you, they can. Hello is a greeting that people constantly say to each other.
Really depends. There is the timeless classic "Merry Christmas" but as the years go on, society has been looking down on this. Many stores do no say this any more. "Happy Holidays" seems like the standard greeting now in public. If the greeting is in a card format you can also go with "Seasons Greetings".
A Greeting
As an informal greeting.
Just a greeting.