Merriam Webster estimates that there are around 1 million words in the English language and the director of the Dutch institute of Lexicality estimates more than 5 million words are used in Dutch.
The 75.000 vs 25.000 number was what my old english teacher told us in class. Seems it's a bit off. Merriam Webster estimates 1.000.000 for english, the Dutch equivalent De Dikke Van Dale has 240.000 words. No way Dutch has 5 million words. English has 500+ million contributers, Dutch only 25 million. And English doesn't change over time. Anybody who knows English can still read Shakespeare from 400 years ago. You don't have to try that with Dutch, it's a completely different language.
But I don't want to go off on a word debate tangent.
Does anyone know how the officials and the players from so many different countries with so many different languages communicate? Is it all by signals?
Lots of communication is done in English. Football is a very international community, with players from all countries playing for clubs in other countries. The top clubs scout their players all over the world. A common interface is needed and English fits the bill just fine.
But in the field, there's actually not much talking needed. The most important signal is the referee's whistle. All the players have their eyes on the ball, so when the whistle goes, they mostly know what it's about. If they want to be sure, they look at the referee and he signals with his hand who gets the free kick. Two line referee's also signal with their flags. Once you know the (simpe) rules, it's easy to understand what's going on.
Only time when talking plays a role in the game is when players want to protest a decision of the referee. Which, of course, is pointless anyway.