Currently the tiles of the sections are in lower case. It’s suggested to use Upper case which looks visually more pleasing in the case of titles.
So instead of “Logo design and branding” it would be “Logo Design and Branding”
It’s something small but thought I’d mention it.
What do you think?
I like it. But reading German a lot, it is very familiar to me anyway.
It’s on purpose as the nornal writing looks more human and is more readable. Title case looks a bit too serious, no?
Having been an employee of a German company working in the United States, I can definitely say this is a cultural thing. 
However, Discourse now supports themes, so you could have a user-selectable “US Theme” that has a CSS modification to use Title Case for category headings. 