Fix a German note in the English text by translating it.

One of the more major things I noticed when reading (or more precisely skimming over) the document.

Question aside: Are you interested in pull requests that just fix minor typos or grammatical errors and do not change anything else? If yes, against which branch?

If yes, I'd try to collect the other things I found into a single pull request and maybe proofread the corrected version once more before submitting :-)

Anyway, keep up the good work :-D