Handle multiple audio tracks

[kayakr]

Overview of feature request
HTML5 audio player can handle multiple <track> elements containing (say) captions for different languages. These are available for selection via browser native player controls but the javascript used by Islandora appears to expect only a single track element https://git.drupalcode.org/project/islandora/-/commit/14726640f891aebb32afa5a99c3e205952943023

Even if I select a different track, only captions from the first <track> element are displayed.

What kind of user is the feature intended for?
User.

What inspired the request?
I want to improve Islandora's handling of audio/video-synced transcripts, e.g. by supporting multiple langauges, offering bi-directional syncronisation between webvtt track and media.

What existing behavior do you want changed?
Handle multiple track elements instead of just one.

Any brand new behavior do you want to add to Islandora?

Any related open or closed issues to this feature request?

• Use Case: Captioning Media Viewer #1924
• Add Captions, Subtitles, and Interactive Transcripts  #1003

/cc @seth-shaw-asu