[BUG] Terminal title incorrectly shows "Russian language input acknowledged" for Ukrainian (Cyrillic) input

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?

When using Claude Code with Ukrainian language input (Cyrillic script), the terminal window title displays:

> Russian language input acknowledged

This happens despite having "language": "Ukrainian" explicitly set in settings.json.

What Should Happen?

The terminal title should correctly identify Ukrainian — or not show language detection at all.

Error Messages/Logs

Steps to Reproduce

1. Set "language": "Ukrainian" in ~/.claude/settings.json
2. Start Claude Code in any project
3. Type a message in Ukrainian (Cyrillic script)
4. Observe the terminal window title

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.100

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_