Session names should be generated in the user's language (not always English)

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

When a new conversation is started in Claude Code, the session name is always auto-generated in English, even when the user communicates entirely in Japanese and has Japanese instructions in CLAUDE.md.

Japanese users (and likely users of other non-English languages) cannot read these English session names, making it impossible to identify past conversations from the sidebar.

Proposed Solution

Session names should be generated in the language of the conversation or based on the user's language settings. Alternatively, provide a setting in Claude Code that allows users to specify their preferred language for session name generation.

Alternative Solutions

Manually renaming each session after creation. This is a workaround but not scalable. Adding Japanese instructions to CLAUDE.md did not affect session name generation.

Priority

High - Significant impact on productivity

Feature Category

CLI commands and flags

Use Case Example

A Japanese-speaking user starts Claude Code. Every new conversation gets an English title like "Address daytime sleepiness and anxiety" or "Test Japanese session naming". The user cannot read these titles and cannot find previous conversations from the sidebar.

Additional Context

_No response_