Don't shout "Achtung Spitfeuer!"
Following on from Beagle's famous and (of course) true tale, I assume that you've heard the ancient one about the BOAC pilot lost on the taxiways at Berlin in the 50s?
Seriously, you need to know when the others in the circuit are saying "downwind" and so forth. You could try Babelfish, but it can be a bit literal minded. Having said that, many words translate from German to English or English to German rather more literally than is the case with Romance languages such as French or Spanish.