[kubb]

This is only a problem when translating words or short phrases which is usually one of the first things that language learners try to do.

When you know the original intent behind a sentence (for example if you are its author), you can usually convey its meaning it in any of the languages you know well.

As your wife said, there is a way to express a friendly sentiment to somebody on their anniversary and let them know that you remember them. It's just not literally using the words "Happy Birthday".