You're right, Penguina
hallo Phil,
Rothenburg is a fairly popular field. Of course primarily German will be spoken there, but I'm sure the guy in the tower speaks English. If not, then there is surely someone there who can since many German pilots love to fly to other countries and must be able to speak English. I wouldn't worry too much. Learning just a few phrases won't really help much since the pronunciation may end up being different then you expect (it's in Bavaria, you know
)!
If possible, check for their website and send them an e-mail about when you plan to be there so they're prepared and have an English speaking person on the mike.
Have fun on your trip!
Westy