My app does not support multiple localisation. But the link you included put me on the right track. After much searching & trying I found that changing the Development Language from "en" to "nl" (actually a region code) does the trick. I did it by editing the file project.pbxproj inside my app's .xcodeproject file, by changing the line "developmentRegion = en;" to "developmentRegion = nl;". It can probably be done through some setting but I could not find it. I know of no way to set this on the Xcode level, so I will have to do it for every app again. But it works. Thanks!

I don't see the app in the list. Should it be there?