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Hi there and welcome Edna
The easiest way to show you how to solve this is for you to refer to the manual which I gave the link to below
It is on page 18, that you go to the menu, then the fourth option in the list.
Then on the right list its the second option.
You will want to select Englisch as this is English in German.
This will then set it back
Let me know please how you go.