Why is my page in another langue I can't even understand what I'm hitting
You just have to click on the "Switch to course" button.
You can always switch courses when you click on the left language flag besides your avatar.
In the list at the bottom you can find "Add a new course (Einen Kurs hinzufügen)".
You have probably selected the wrong source / base L1 language.
All the discussions and screens will be shown in the source language, not a 3rd (English) one!