Support Chinese (Traditional/Simplified) UI language

Feature Request

The Claude Code interface is currently English-only. It would be greatly appreciated if the UI (sidebar, menus, labels, and other interface elements) could support Chinese language (Traditional and/or Simplified) to improve accessibility for Chinese-speaking users.

Why this matters

Chinese is one of the most widely spoken languages in the world. Many users who would benefit from Claude Code are more comfortable working in Chinese. Adding UI localization support would make the tool significantly more accessible to this large user base.

Proposed solution

Add Chinese (Traditional and Simplified) as supported UI languages that users can select in settings.