@ PhilD
Just my humble piece of advice. As stated above you'll certainly find someone able to speak English either in the TWR or in the circuit. If all fails, you could ask Langen Information (127.975 MHz) to announce your flight to the airfield via landline and get you the information needed (RWY in use, failures, special use of airspace, the likes ...). Thereafter "downwind", "base" and "final" are understood by every one.
Have a nice trip,
FR