Hello,
sorry, I have no idea about the German requirements, but I think there is a general standard which you have to meet in order to enroll at a German university. For further information, please contact: sekretariat@lfed.rwth-aachen.de (secretary of Prof. Butzkamm) or butzkamm@lfed.rwth-aachen.de (Prof. Butzkamm himself) They might be able to help you to solve your problem.
Kind regards, Britta Weber (Seniorat Anglistik)