Maybe it could be a solution to make an in and output in every language possible.
Could it not be a simple way about a predefinete country in the options to tell the device that every input will be in german.
Like in translation Mode… the device will first translate the input into english … have a look for the request … and than translate the english answer back to the on the device selected language.
It already is working if i tell the device at the end of the task and " provide me that answer in in xy (language)" without problems.
Same if i use Vision… and say descripe me the stuff you see “and provide me the answer in xy ( language )”.