[Update]
Thanks for your understanding. I have already left a note for international users, both in the description field and the summary field as well.
[/Update]

This extension is a tweak for a Chinese video website bilibili.com, where the UI and most contents are presented in Chinese.

There is no reason someone with poor Chinese will visit that website.
Thus there is no reason someone with poor Chinese will use this extension.
Therefore there is no reason for me to translate that extension, until bilibili.com supports other languages in the future.