Currently the ULS does not support content language change, that makes "Display settings" redundant with the main list of languages. In addition, some sites where do not have a clear separation between content and UI (compared to Wikipedia article vs. chrome) which translates into a low need to set them separately.
Until the selector is able to set both UI and content language, or for wikis that only require one kind of selection, display language selection can be optionally removed and present the view as font settings. A mockup is provided at: http://i.imgur.com/PGdtu.png
Version: master
Severity: normal
Whiteboard: ux