edX Dual Subtitle - Harvard and MIT courses

edx has many courses from Harvard and MIT, they support downloading mp4 and subtitles. If you don't ask verified certificate, it is free. The plugin supports double subtitles for this course. You need down the mp4 and subtitle then upload them.
Subtitle Mode: Support off, Single, and Dual
Second Language: supports 12 languages showing dual subtitles, they support Arabic, Chinese Traditional, Chinese Simplified, French, German, Hindi, Italian, Japanese, Korean, Portuguese, Spanish, and Turkmen.

If you have any ideas, issues, or suggestions, you can send them to me at [email protected]