Session titles should match conversation language (Japanese titles became English after update)

Description

After updating Claude Code VS Code extension from 2.1.84 to 2.1.85 (March 27, 2026), auto-generated session/conversation titles switched from Japanese to English, even when the entire conversation is in Japanese.

Before (2.1.84)

Session titles were generated in Japanese, matching the conversation language. This made it easy to identify sessions at a glance.

After (2.1.85)

All new session titles are generated in English (e.g., "Create custom VS Code theme", "Add tracking number noti..."), making it harder for Japanese-speaking users to quickly identify what each session was about.

Expected behavior

Auto-generated session titles should match the language of the conversation (or at least respect the user's locale/language preference).

Environment

• OS: Windows 11
• VS Code Extension: 2.1.85
• CLI: 2.1.12
• Language: Japanese