Refactor kwdemo and make output translatable Better reflect the actual behaviour of the extension: - Make map arguments and -f/--rcfile not mutually exclusive but extend the current configuration - Map arguments and -f/--rcfile both override the defaults even when -d/--default is specified - -d/--default only overrides the current configuration Inform the user about extending/overriding behaviour, but only at the beginning; the following messages become terser, making the output translatable without too much code clutter. Rephrase help (use "short/long" option notation etc.).