Everyone loves subtitles , as not every good movie is made in your own language but sometimes you may not find a subtitle file in your own language but it may be in some other language , like for me i prefer English subtitles but some movies have Italian, French, Arabic, or Chinese subtitles and then I use Open Subtitle translator software to convert them to English .

Open Subtitle translator is a freeware software written in java that can be used on any platform and it allows one to translate subtitle from any given language to other, it uses Google translate so the languages you are using should be supported by Google translate.

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You can download it here

Hope this app helps  you get your subtitles in correct language , if any problems ask in comments .