So I had no choice to select de keyboard layout at installation and thought ch/au whould be the same. ok my bad but now I changed it via "localectl set-keymap de" and i works for most things. Just not in and lockscreen / loginscreen. Further more before I changet it, it was en/us layout i think, now it is somthing way different.
For exaple with de layout I am used to "shift + 1 is !" before the change it was "shift + + is !" now it is "alt + + is !"
localectl status says
System Locale: LANG=de_DE.UTF-8
VC Keymap: de
X11 Layout: de
X11 Model: pc105
X11 Options: terminate:ctrl_alt_bksp
In my noob eyes it should be corret but it isnt.