✨ feat: add i18n support for English and Chinese

Add Thunderbird _locales/ based internationalization with en and zh_CN translations. All UI text, provider info, badges, and dynamic status messages are now localized.

Author: rfiacne

README.md

@@ -128,7 +128,7 @@ Choose from **5 leading cloud AI providers** or run a **local Ollama** model:
 ```bash
 git clone https://github.com/Nigel1992/AutoSort-Plus.git
 cd AutoSort-Plus
-zip -r autosortplus.xpi manifest.json background.js options.js options.html styles.css content.js icons/
+zip -r autosortplus.xpi manifest.json background.js options.js options.html styles.css content.js icons/ js/ _locales/
 ```
 
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