Support "...from English" autogenerated subtitles

[fsobolev]

Example video: https://www.youtube.com/watch?v=Jr8EGJwDCk8

Subtitle codes here are LANG-en where LANG is 2 or 3 characters language code.

$ yt-dlp --list-subs https://www.youtube.com/watch?v=Jr8EGJwDCk8
[youtube] Extracting URL: https://www.youtube.com/watch?v=Jr8EGJwDCk8
[youtube] Jr8EGJwDCk8: Downloading webpage
[youtube] Jr8EGJwDCk8: Downloading ios player API JSON
[youtube] Jr8EGJwDCk8: Downloading android player API JSON
[youtube] Jr8EGJwDCk8: Downloading m3u8 information
[info] Available automatic captions for Jr8EGJwDCk8:
Language   Name                               Formats
en                                            vtt
af-en      Afrikaans from English             vtt, ttml, srv3, srv2, srv1, json3
ak-en      Akan from English                  vtt, ttml, srv3, srv2, srv1, json3
sq-en      Albanian from English              vtt, ttml, srv3, srv2, srv1, json3
am-en      Amharic from English               vtt, ttml, srv3, srv2, srv1, json3
ar-en      Arabic from English                vtt, ttml, srv3, srv2, srv1, json3
hy-en      Armenian from English              vtt, ttml, srv3, srv2, srv1, json3
as-en      Assamese from English              vtt, ttml, srv3, srv2, srv1, json3
ay-en      Aymara from English                vtt, ttml, srv3, srv2, srv1, json3
az-en      Azerbaijani from English           vtt, ttml, srv3, srv2, srv1, json3
bn-en      Bangla from English                vtt, ttml, srv3, srv2, srv1, json3
eu-en      Basque from English                vtt, ttml, srv3, srv2, srv1, json3
be-en      Belarusian from English            vtt, ttml, srv3, srv2, srv1, json3
bho-en     Bhojpuri from English              vtt, ttml, srv3, srv2, srv1, json3
...

Instead of asking users to also type such codes in preferences they can be autogenerated. For example, if there's it, fr in settings then Parabolic could pass it, it-en, fr, fr-en to yt-dlp.

[nlogozzo]

https://github.com/NickvisionApps/Parabolic/releases/tag/2023.11.0-beta2

Will be available via flathub-beta within the hour!