Update German translation of the rules:

- add information about no-following to the botting rule
- replace ae,oe,ue,ss with ä,ö,ü,ß
Run 'make maps' for client-data changes.

Updated submodule pointer.
Be coherent about what's armor and what's a weapon

Newly added assertions in the server caught this.
Brodomir cave: on reward, skip calling getitem if there is no item to give.