Moin has a default, builtin password checker. It is intended to deny the most trivial passwords.
For this, it contains keyboard sequences to check the password against them. You can help by adding your keyboard below:
keyboards = [ur"`1234567890-=qwertyuiop[]\asdfghjkl;'zxcvbnm,./", # US kbd
ur"^1234567890ß´qwertzuiopü+asdfghjklöä#yxcvbnm,.-", # german kbd
ur"^1234567890'^qwertzuiopü¨asdfghjklöä$<yxcvbnm,.-", # german swiss kbd
]