[BUG] Suddenly Claude replies in Italian

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?

Despite the response language settings in the Claude Code configuration, sometimes, out of nowhere, Claude starts replying in Italian. I don't have anything in the code that would suggest this. The only languages ​​I speak are Polish and English.

What Should Happen?

It should always (no matter what) respond in the language according to your settings.

Error Messages/Logs

Steps to Reproduce

Hard to reproduce.

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.50

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_