Identify audio stream languages

[grabthefish]

Version

v6.4.4

Platform

.NET 8 / Windows 11

Steps to reproduce

When trying to download a video with audio streams in multiple loanguages we can't see which stream is in which language
for example https://www.youtube.com/watch?v=ngqcjXfggHQ has audio tracks in 5 different languages so when selecting a track to download it's like rolling a dice

Details

the language of an audio track/stream and whether it's the default language gets downloaded in the manifest json and should probably be added to IAudioStreamInfo

"adaptiveFormats": [
    ...
 
  {
    ...
    "audioTrack": {
      "displayName": "Portuguese (Brazil)",
      "id": "pt-BR.10",
      "audioIsDefault": false
    }
    ...
  },
  {
    ...
    "audioTrack": {
      "displayName": "English (United States) original",
      "id": "en-US.4",
      "audioIsDefault": true
    },
    ...
  }

Checklist

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