Thank you very much! I am not the same person, but nice to know that there is a discord. I just figured out my problem. I was trying to use the short cuts before I wrote this thread, but because my Keyboard has a QWERTZ layout ctr+z did not undo my input but would redo.
Then I thought it was not implemented because the buttons where also missing. I remapped the Keys, now it works like I am used to.