I had put the latest 5 Common Voice marketing videos and default subtitle (en, it, de, fr, sp) (from 1 and 2) into Amara. You can translate and embeddable them freely with it.
Notes: the finish subtitles won’t be (automatically) go to the original Youtube videos.
(I often download the translated subtitles from Amara for local offline events, and also re-uploading them to our community’s own youtube channel.)