Hi, brand new to the forum and I realized recently that as a hearing impaired person I've been benefiting from others' hard word for years by using uploaded subtitle files and that I've never given anything back. So, in searching for a useful niche I found that there exist very few available subtitle files that include (specific language) subtitles for all languages in those films that have spoken dialogue in more than one language. That is to say, for example, the film "Dark Blue World" about expatriate Czech (and other nationalities) pilots who flew for the Royal Air Force during WWII. This film has spoken dialogue in English, Czech, French, and Polish, and while one can easily find, say, English subtitles for any one given language spoken in the film (e.g. English to English, or French to English, or Czech to English, etc.) the remaining dialogue remains un-subtitled. This is fine for those with normal hearing who just need subtitles for the languages they don't understand but for the hard of hearing it doesn't get the job done; we need all dialogue subtitled, regardless of the language.
So, this is my project. Is there a way, using Jubler or other software, to combine already available subtitle files for a given film to produce one file that will display (e.g. English) subtitles for all dialogue in a multi-language film? Doing this manually is tedious in the extreme and any help would be greatly appreciated. Thanks!