Feature Request: Traditional Chinese (zh-TW) localization for CLI UI

Summary

Please add Traditional Chinese (zh-TW) localization support for the Claude Code CLI interface, including dialogs such as /usage, /help, status messages, and all interactive TUI components.

Motivation

Many users in Taiwan actively use Claude Code, but all UI text is English-only. A localization system (either based on system locale or a configurable language setting) would significantly improve usability for non-English speakers.

Expected Behavior

• CLI UI text (dialogs, labels, warnings, prompts) should render in the user's configured locale
• Support at minimum: zh-TW (Traditional Chinese) and zh-CN (Simplified Chinese)
• Fallback to English if locale is not supported

Current Behavior

All UI text is hardcoded in English with no way for users to customize or override it.

Suggested Implementation

• Introduce a language or locale config option in settings.json
• Load locale string bundles at runtime
• Community contributions for translation files

Thank you for considering this request!