As written serval times in this forum

contact an Autel dealer (Autel Europe) with serial number of your device.
They can trigger the change in language for your device. Which will be Germany from then on. You get only ONE language on the system.

 There is a funktion on the device to change the language but i can get installed only one language?

  Hi, Fware is right that basically we only authorize one language for a tool. But if some customers have some special requests, we may authorize two languages for them. Thanks!