New terminal layout, showing more useful keys at the same time

I didn't like how I had to switch to numbers or functions to press numbers or the tab key, respectively. So I changed the terminal layout a bit. Numbers are now available at the top and at the bottom are tab and the arrow keys. Switching the view reveals del, escape, home, end, pgup and pgdown. The keys are now a little bit smaller but I think they are still easy enough to hit. I based it off of the German layout and added the F-keys to the umlaut-view.

Only thing missing are the modifier keys.