If you visit https://www.minecraft.net/marketplace while the language on minecraft.net is set to German the "QUESTIONS? CHECK OUT OUR FAQ" button will redirect to https://www.minecraft.net/de-de/marketplace/faq, which is a 404 dead link.
I am not sure if this is something that can be fixed, but the link should probably go directly to the help article instead of a redirect through https://www.minecraft.net/marketplace/faq to avoid such issues.
An odd workaround to this issue: If you set the language to english, and then press the back button (or go to https://www.minecraft.net/en-us/marketplace and edit the URL to be /de-de/), the FAQ button works.