For me the ADe/Aph/APub v2 Online Help system for Desktop apps has a localization bug in showing up as default the wrong user browser/system language via/in the bottom left language choice popup menu. - AFAI can see only the V2 Desktop apps Online Help is affected here, the iPad and older v1 online helps are not affected from this.
Here it should be "Deutsch" as default for me instead of "English (UK)" for every V2 Desktop online help ...