The ability to quickly translate specific languages into subtitles for a video is a GREAT feature. But...it's time consuming and tedious when you're translating the same languages for each video that goes live on Youtube.
The suggestion is to allow us to pick languages similar to the dropdown in the screenshot and then have those set as the languages we want to be translated for each video. Maybe a button that automatically applies them to the video in question or some other method of adding and translating the same languages.