Greasy Fork is available in English.
Enhances YouTube with dual language subtitles.
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This script was originally created by Coink Wang and was hosted at Youtube double language subtitle / Youtube 双语字幕.
CY Fung discussed the issue with Coink Wang and created a PR (PR#18) which rewrote most of the code.
There has been no further response from Coink Wang for over half a year.
Now, the PR has become a new userscript listed on Greasy Fork.
Youtube dual subtitle / Youtube 双语字幕全平台示範 Demo : https://www.youtube.com/watch?v=M2cckDmNLMI
Other samples: