Scandinavian subtitles are included in 80%+ of the movies. Maybe you can't see them all because the app/software you use can't show all of the subtitles.
VLC shows all the subtitles available for example.
One more thing to add. It is impossible to include Dutch or any other language subtitle in every movie. Some movies have Dutch subtitles, some don't, like any other language. This fully depends on the subtitle community (subtitle creators). Popular movies have mostly all the requested subtitles released.
Even a movie which is released 10 years back doesn't contain all the subtitles needed for everyone.