Can't generate subtitle of a private video
When updating a private video, for example : https://tube-test.apps.education.fr/w/viz81zAh99AHAmrizcoKz6
It fails generating a subtitle.
When looking at logs we see an unauthorized request to : https://tube-test.apps.education.fr/api/v1/videos/17717/captions
The plugin uses some API calls for a few operations. Some of some are unauthenticated, though are failing for a private video.
The user token might be used to make theses API calls instead.