A lot of information was shared over the years by Saphirus or one of the developers when questions were answered. Like competition groups or how the associations are divided into 4 groups for worker auctions. I linked some of it when answering questions here in the english part already like in this thread. It's spread over the threads and we have to search for it there ourselfs though. I saved links to some threads with usefull information for quick access. For example this: Karrierebutton Farben und Federn
In Anleitungen & Tutorials are many FAQs and tutorials that should be translated.
I will work on it and make a forum topic when i'm done.
Edit: Don't we need @Amalis_DE permission first? or is he/she not active anymore?
Edit2: It's just Amalis asking about the career level stars. It has nothing to do with a guide.