SubTrans is a general subtitle translator Suite. It is developed to work with any sites that allow video captions. The extension supports AT LEAST one official subtitles / caption. It translates the subtitles automatically. If you have a video with a lot of captions, SubTrans will help you translate them easily.

SubTrans will load a specified subtitle / caption when you visit a site. 

There are options that also allow you to drag and reposition the subtitle box. The extension also allows you to resize it if you prefer seeing larger or smaller texts.

The settings are also saved on your browser, so videos on supported websites will automatically show your two preferred languages.