Im sure they also speak English quite well.

Indeed they do (and far better than most English-speakers speak any foreign language). My point was that this has been professionally translated from Greek into many languages, beginning with German on January 13 (paywall, sadly). So there is no point in criticising the English of the original Greek author or authors.

Hm, not the feeling I got. Scandinavian countries (and Cypriots but that's a special case) are way more fluent in English with a way better accent (better == clearer) than Germans I've met. And I've met a lot of both actually.