[FEATURE] Add Chinese (zh-CN) localization for CLI UI strings

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

The Claude Code CLI currently displays all UI strings in English — including base command prompts, plan mode approval dialogs, permission prompts, and menu options like /memory selection. For
Chinese-speaking developers, this creates friction in an otherwise smooth workflow.

Request: Add a Chinese (zh-CN) locale option so that CLI UI strings render in Chinese after configuring it (e.g. via a locale setting in settings.json or an environment variable).

Examples of affected strings:

• Plan mode: "User has approved your plan. You can now start coding."
• Permission prompts: "Claude Code needs your permission to run..."
• Memory editing: "Opened memory file at..."
• /context output: "Context Usage", "Estimated usage by category", "Free space"
• Task status indicators: "pending", "in_progress", "completed"

Proposed Solution

Suggested implementation:

• Add a locale setting accepting "en" and "zh-CN" (defaulting to "en" for backward compatibility)
• Extract UI-facing strings into locale resource files
• Community contributions for translation can follow once the framework is in place

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

Configuration and settings

Use Case Example

_No response_

Additional Context

_No response_