[Feature Request] Chinese (zh-CN) localization for Codex CLI

Problem

Codex CLI only supports en-US, en-GB, de-AT, id-ID despite desktop app having full zh-CN support.

Expected

CLI should support zh-CN when LANG=zh_CN.UTF-8.

Tech Detail

CLI uses Rust i18n-embed + Fluent. Chinese .ftl files need to be added.

Binary analysis (v0.141.0 macOS-arm64):

• Only 5 language codes embedded: de-AT, en-DE, en-GB, en-US, id-ID
• zh-CN missing entirely

Desktop app already has zh_CN.lproj/ with translations that could be adapted.