That's inconvinient when your keyboard has a different layout.
You can change it to the one you use by adding this to the APPEND statement in your boot configuration:
With these two setting, you receive most messages in german and the keyboard is set to swiss german.
The layout is correct in the X-Window system and in the terminals inside X.
On the console (Switch with CTRL+ALT+F1..F6) you will still have the us keyboard, if anyone has a tip...