- void audio_language_changed (dcp::LanguageTag tag);
- void enable_main_subtitle_changed ();
- void main_subtitle_language_changed (dcp::LanguageTag tag);
- std::vector<dcp::LanguageTag> additional_subtitle_languages ();
- void set_additional_subtitle_languages (std::vector<dcp::LanguageTag> languages);
- void edit_release_territory ();