@trinsec There's definitely more, but I'm not sure how much more is translated from french. I've got a couple of fan-translations, but only fragments and I'm not sure how well they carry the jokes.
The only English translations I could find are for Kindle on Amazon.
I just ordered a German paperback edition at Carlsen Verlag. There seems to be a 2nd volume on the way, too.
The German translation seems OK, as far as I can tell.
Have you seen any actual pages of the German translations? Both Carlsen and Amazon only seem to provide the front and back covers without text. :)