[BUG]

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

The Claude Code Desktop app sidebar displays conversation titles in English, regardless of the language used in the conversation or the system/app language settings. Since conversations are conducted entirely in another language (Spanish in my case), the sidebar titles should reflect that language rather than defaulting to English. Specially since the app's global language is set to Español (España) in my case.

What Should Happen?

Conversation titles should be generated in the same language as the conversation content. Ideally, the app should also respect the macOS system and/or the apps own global language setting for UI elements, like conversation titles.

Error Messages/Logs

Steps to Reproduce

1. Set macOS system language to Spanish (or any non-English language)
2. Open Claude Code Desktop app
3. Have multiple conversations entirely in Spanish
4. Look at the sidebar — conversation titles and generated in English

Environment

• Claude Code Desktop app (macOS)
• macOS Tahoe
• System language: Spanish (Spain)

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.107

Platform

Other

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

This happens in the Claude Code side of the MacOs Desktop App. Yet, in the Claude Chat side of the same app, conversation appear correctly in Spanish