* Canonical capitalization of headings
* Update copyright
* Base background on CSS: avoid scroll issues

Issue-Ref: 3834
Issue-Url: https://af3-developer.fortiss.org/issues/3834



Signed-off-by: Simon Barner <barner@fortiss.org>

Issue-Ref: 3620
Signed-off-by: Alexander Diewald <diewald@fortiss.org>