Video captions below video field
I have been unable to find any existing module to do this and would be quite surprised if one existed. You will very likely have to develop your own module.

Here is a brief rundown of how such a module might work:


Implement a new field type providing either a form for the user to create the subtitles or upload a subtitle file in one of the many subtitle formats. https://support.google.com/youtube/answer/2734698?hl=en
Parse the input from the form and store it. You'd likely want to store it as JSON or something else that will be easy to work with in JavaScript
Write code to pass the data to the browser
Use Javascript to update the Language 1 and Language 2 content to match the data in your stored subtitle file. You can use the YouTube API to get the current time of the video https://developers.google.com/youtube/iframe_api_reference#Playback_status


I think it would be a lot easier to just use YouTube to do this but I'm sure you've already thought of that.