DREAMWEB: Add localised commands in the network terminal

The original interpreter only used english commands in the terminal
even when playing one of the localised version (and even though
everything else in the terminal was localised). This adds the possibility
to either use the English commands or the localised ones.
Localized commands have been added for French, German (thanks to
SimSaw, who also proposed that idea) and Italian (thanks to Maff).