German translation added
German translation added

I aimed for consistency and reuse of expressions to make using the app
easier for the german-speaking user.

jsantacruz/digital-ocean-swimmer,yassirh/digital-ocean-swimmer,guywithnose/digital-ocean-swimmer,yassirh/digitalocean-swimmer,yassirh/digital-ocean-swimmer,guywithnose/digital-ocean-swimmer,chamss19/digital-ocean-swimmer,dungphanxuan/digital-ocean-swimmer,jsantacruz/digital-ocean-swimmer,chamss19/digital-ocean-swimmer,yassirh/digitalocean-swimmer,dungphanxuan/digital-ocean-swimmer