Feature Request: Chinese / multilingual UI localization for permission prompts

Summary

Add support for Chinese (and eventually other languages) localization of Claude Code's built-in UI text — permission prompts, status lines, hook status messages, and system dialogs.

Motivation

Claude Code is used globally. Non-English users currently face English-only prompts:

• Permission allow/deny dialogs
• Hook status messages ("Loading caveman mode...", "Tracking caveman mode...")
• Tool execution feedback
• Status line indicators

For non-English speakers, these prompts create friction every session. The AI can reply in the user's language via CLAUDE.md, but the harness UI remains English-only.

Proposed Solution

1. Add a locale / language setting in settings.json (e.g. "locale": "zh-CN")
2. Localize the most frequent prompts first: permission dialogs, hook status messages, status line
3. Fall back to English for untranslated strings
4. Accept community-contributed translations

Example

Current:

Allow Bash(curl -s http://127.0.0.1:8188/object_info)?

With Chinese locale:

允许 Bash(curl -s http://127.0.0.1:8188/object_info)？

Minimum Scope

• Permission allow/deny prompts
• Hook statusMessage
• Status line
• /help output