I haven't been outside for a week yet and I already know a second language, English.
Maybe not perfect everywhere yet. Sometimes a little too much "google-style" but it's still growing out.
How it works? That's easy.
On each page you can see the British and German flags at the bottom right of the page. And this means you can switch between German and English on every page. The language only changes if you switch back to the other language below. As long as this doesn't happen, you'll surf in the language you set.
At this point again: If you notice an error, please bring it forward. English is not our native language and we read against it, but Google Translate gave us the basic structure. And he doesn't understand everything the way it is intended.