Show these characters only for users that have the corresponding locale
installed (a supported eu language for €, en-GB for £).
Add these characters to most layouts.
- Add the umlauts back.
- Remove the accents. QWERTZ changes from "programming layout" to
"localized layout".
- Move the '?' away from the edge of the screen.
Add a new boolean parameter "edgekeys" for defining keys that have the
additional (swipe) keys on the edges (top, right, left, bottom) instead
of at the corners (top left, top right, bottom left, bottom right).
