Move deletion of Lua files in Windows Installer
Preserves Lua directories in the x86 and x64 folder so that extra
lua files can be included in the installer. In particular this is
for lua-socket.
Make mapping WASD less intimidating

replacing key_mapping.lua with key_mapping.txt to make it less
intimidating. As most people know how to open text files and may not
realise you can open lua files in the same way.
Norwegian translation
Spelling mistake

Very minor correction.