"Someone is playing soccer at the stadium."
Translation:Хтось грає у футбол на стадіоні.
"The United States and United Kingdom are two countries divided by a common language!"
Both are accepted and both commonly used to name this particular game.
Please first consult the Internet, books or other people before confidently posting something you actually don't know.
"Soccer" is short from "association football", this name comes from the days when there were many different ways to play football with different sets of rules, unlike now when we ended up just choosing one.