The word "Xi" refers to the happy words posted by China at his wedding. There are at least two expressions in English:
(1) is often directly expressed by "happy word" or a "happy";
(2) The word "happiness" can also be used in a few cases;
If you like it, you can translate it into like/like something.
Good news/events (indicating that one thing is good, it is a happy event), happy events (especially those such as the birth of a child), weddings and so on can all be used to indicate happy events.