qwen-code/docs/users/features/language.md
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Add Japanese
日本語の追加と各言語でのメニュー表記の修正
2026-01-02 15:53:20 +09:00

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# Internationalization (i18n) & Language
Qwen Code is built for multilingual workflows: it supports UI localization (i18n/l10n) in the CLI, lets you choose the assistant output language, and allows custom UI language packs.
## Overview
From a user point of view, Qwen Codes “internationalization” spans multiple layers:
| Capability / Setting | What it controls | Where stored |
| ------------------------ | ---------------------------------------------------------------------- | ---------------------------- |
| `/language ui` | Terminal UI text (menus, system messages, prompts) | `~/.qwen/settings.json` |
| `/language output` | Language the AI responds in (an output preference, not UI translation) | `~/.qwen/output-language.md` |
| Custom UI language packs | Overrides/extends built-in UI translations | `~/.qwen/locales/*.js` |
## UI Language
This is the CLIs UI localization layer (i18n/l10n): it controls the language of menus, prompts, and system messages.
### Setting the UI Language
Use the `/language ui` command:
```bash
/language ui zh-CN # Chinese
/language ui en-US # English
/language ui ru-RU # Russian
/language ui de-DE # German
/language ui ja-JP # Japanese
```
Aliases are also supported:
```bash
/language ui zh # Chinese
/language ui en # English
/language ui ru # Russian
/language ui de # German
/language ui ja # Japanese
```
### Auto-detection
On first startup, Qwen Code detects your system locale and sets the UI language automatically.
Detection priority:
1. `QWEN_CODE_LANG` environment variable
2. `LANG` environment variable
3. System locale via JavaScript Intl API
4. Default: English
## LLM Output Language
The LLM output language controls what language the AI assistant responds in, regardless of what language you type your questions in.
### How It Works
The LLM output language is controlled by a rule file at `~/.qwen/output-language.md`. This file is automatically included in the LLM's context during startup, instructing it to respond in the specified language.
### Auto-detection
On first startup, if no `output-language.md` file exists, Qwen Code automatically creates one based on your system locale. For example:
- System locale `zh` creates a rule for Chinese responses
- System locale `en` creates a rule for English responses
- System locale `ru` creates a rule for Russian responses
- System locale `de` creates a rule for German responses
- System locale `ja` creates a rule for Japanese responses
### Manual Setting
Use `/language output <language>` to change:
```bash
/language output Chinese
/language output English
/language output Japanese
/language output German
```
Any language name works. The LLM will be instructed to respond in that language.
> [!note]
>
> After changing the output language, restart Qwen Code for the change to take effect.
### File Location
```
~/.qwen/output-language.md
```
## Configuration
### Via Settings Dialog
1. Run `/settings`
2. Find "Language" under General
3. Select your preferred UI language
### Via Environment Variable
```bash
export QWEN_CODE_LANG=zh
```
This influences auto-detection on first startup (if you havent set a UI language and no `output-language.md` file exists yet).
## Custom Language Packs
For UI translations, you can create custom language packs in `~/.qwen/locales/`:
- Example: `~/.qwen/locales/es.js` for Spanish
- Example: `~/.qwen/locales/fr.js` for French
User directory takes precedence over built-in translations.
> [!tip]
>
> Contributions are welcome! If youd like to improve built-in translations or add new languages.
> For a concrete example, see [PR #1238: feat(i18n): add Russian language support](https://github.com/QwenLM/qwen-code/pull/1238).
### Language Pack Format
```javascript
// ~/.qwen/locales/es.js
export default {
Hello: 'Hola',
Settings: 'Configuracion',
// ... more translations
};
```
## Related Commands
- `/language` - Show current language settings
- `/language ui [lang]` - Set UI language
- `/language output <language>` - Set LLM output language
- `/settings` - Open settings dialog