Grüezi 
On the Pressbooks book covers, the authors list is separated with semicolons, and before the last name, the word “and” is used together with a semicolon before. At least in 
and probably other German-speaking countries, this is an incorrect use of punctuation and should be changed for a list of names. It should use a comma to separate persons, and either also separate the last person only with a comma, or with an and, but not with both together.
Wrong in current pressbooks-book themed book:
Prof. Dr. Michael Müller; Prof. Hans Schmidt; Anna Meier; and Lukas Fischer
Correct variant A:
Prof. Dr. Michael Müller, Prof. Hans Schmidt, Anna Meier, Lukas Fischer
Correct variant B:
Prof. Dr. Michael Müller, Prof. Hans Schmidt, Anna Meier und Lukas Fischer
In the Pressbooks directory, the authors list is correctly separated, just with commas. Could this be changed in the official pressbooks-book theme? Or is there a place where we could customize it ourselves?
Kind regards
Chris