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README.md

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+# AI Novel Generator Pro v4.0
+
+## 📖 Documentation / Tài liệu / 文档
+
+| Language | Link |
+|----------|------|
+| 🇨🇳 中文 (Chinese) | [locales/CN/使用说明.md](locales/CN/使用说明.md) |
+| 🇻🇳 Tiếng Việt (Vietnamese) | [locales/VI/使用说明.md](locales/VI/使用说明.md) |
+
+## 🌐 i18n (Internationalization)
+
+The application supports multiple languages. Language files are stored in the `locales/` directory:
+
+```
+locales/
+├── i18n.py               # i18n helper module
+├── __init__.py            # Package init
+├── CN/
+│   ├── messages.json      # UI strings in Chinese (default)
+│   └── 使用说明.md         # Documentation in Chinese
+└── VI/
+    ├── messages.json      # UI strings in Vietnamese
+    └── 使用说明.md         # Documentation in Vietnamese
+```
+
+### Switching Language
+
+Set the `APP_LANGUAGE` environment variable before starting the app:
+
+```bash
+# Chinese (default)
+python app.py
+
+# Vietnamese
+set APP_LANGUAGE=VI
+python app.py
+```
+
+### Adding a New Language
+
+1. Create a new directory under `locales/` (e.g. `locales/EN/`)
+2. Copy `locales/CN/messages.json` as a template
+3. Translate all values in the JSON file
+4. Set `APP_LANGUAGE=EN` and start the app