Learn to speak algebraic notation. When someone says a square you should know the color and location. You should be able to go over variations in your head and read chess books without a board.
What languages should I learn if I want to be an American grandmaster?

Learn to speak algebraic notation. When someone says a square you should know the color and location. You should be able to go over variations in your head and read chess books without a board.
Good answer.
There are strong players in practically every country of the world. It depends where you want to go. I'd think that European languages would be common in Europe, Spanish in Spain and South America, Russian in Russia, German in Germany, Swedish in Sweden, etc. You can pick up a few hundred words of a language in a couple days if you need to. But none of that is required to be a GM. To be a GM you need to play solid moves at the new faster FIDE time control against other players in the same time pressure.
It seems that a lot of chess players know English. It makes me wonder what languages are improtant for international grandmasters? I know how low my rating is, but I still want to be a grandmaster someday.