Added Chinese translation and automatic theme color switcher.

[listill]

Since I discovered the extension, it has saved me a lot of time securing email addresses.

To make this extension better, I did the following two things.

1. Added an "Auto" theme pattern to follow the system's preferences.
2. added Chinese support, I believe this can help more Chinese users to use the extension better.

Finally, thank you for the open source.

[Curetix]

Thanks a lot for your contribution, I just made some small adjustments. If you have any other suggestions, feel free to let me know 🙂

[listill]

As a small suggestion, I've adjusted the LANGUAGE_ENGLISH field in Chinese based on your change, which is only a one character change.

Do I need to start a new Pull Request, or can you check my commit and you can do the change?

LANGUAGE_ENGLISH: "🇬🇧 英文 (English)",
LANGUAGE_ENGLISH: "🇬🇧 英语 (English)",

[Curetix]

As a small suggestion, I've adjusted the LANGUAGE_ENGLISH field in Chinese based on your change, which is only a one character change.

Do I need to start a new Pull Request, or can you check my commit and you can do the change?

LANGUAGE_ENGLISH: "🇬🇧 英文 (English)", LANGUAGE_ENGLISH: "🇬🇧 英语 (English)",

No problem, I updated it.

[listill]

Great, I don't have any other more suggestions for now.