Created attachment 1511454 [details] "menü" config window. Description of problem: Fresh upgraded F27 -> F28 : missed glib-langpack-de on upgrade and , as it looks, like several other langpacks. Check Screenshot.
Have you tried to install them manually? Is then everything correctly displayed?
glibc-langpack-de got installed manually, but no other pack, as none specific is available. glic-langpack-de fixed bash complains about the timeinformations. TODAY the text in that menu is entirely in german, so something fixed it.