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I am not sure what you mean. Have you taken the English subtitles for the film, and then translated them, or do you want to create the Castilian subtitles from scratch?
Your English is excellent but we don't say mute for movies in English. We call it a silent film or movie. Mute usually indicates an inability to make sound.
Perhaps the freeware Jubler program might be useful, please get back to clarify. http://www.jubler.org