I've made a DVD with subtitles in english and german. In the beginning of this movie You can choose between these languages - and norwegian. I know how to write this in norwegian, but what shall I call the "english button" and the "german button" in english and german. Is it correct with:
1: English subtitle
2: Untertitel Deutsch

It is not a good idea to start the movie in a wrong way. I've got help from other people to translate the movie from norwegian......

For English, "English Subtitles" is better. These are subtitles, not a single subtitle. And menu items are often capitalized.

As for German, I will let a German answer that. Though if I was in a hurry and did not have a native German speaker available, my guess would be "Deutsche Untertiteln."