How to do one card
- Click Open in YouTube Studio — that's the video this track goes on.
- In Studio: Subtitles → Add Language → pick the language shown on the card.
- Click Download audio, then upload that MP3 as the dubbed audio track.
- Click Copy title and paste it into the translated title field.
- Click Copy description and paste it into the translated description field.
- Publish, then hit Mark as uploaded on the card.