[a11y] 11.7 User preferences

[tschiebel]

audit: https://infinite.owncloud.com/s/qSvYucPltEYUhhc

https://github.com/BIK-BITV/BIK-App-Test/tree/main/Pr%C3%BCfschritte/de
https://www.etsi.org/deliver/etsi_en/301500_301599/301549/03.02.01_60/en_301549v030201p.pdf

Personal Space

• The system setting "Dark design" is not supported by the app.

• Both the system-wide settings "Bold text" and "Larger text"
  are not fully supported. Some components do not change their settings
  settings accordingly.
  

Menu, Shared with me, Shared with others, Spaces, Add Account, Image Viewer

• The system setting "Dark design" is not supported by the app.