Feature request: localize built-in slash command descriptions

Summary

Built-in slash command descriptions shown in the CLI (e.g. /exit, /context, /design, /doctor, /clear, /compact, ...) are hardcoded in English inside the CLI binary. There is currently no way to localize or translate these strings via configuration (settings.json, CLAUDE.md, etc.).

Request

Add a way to display built-in slash command names/descriptions in the user's preferred language (e.g. Korean), similar to how other CLI tools support locale-based UI strings.

Context

A non-English-speaking user wanted the command list (/help output) shown in their language, and there was no supported mechanism to do so — this is UI chrome owned by the CLI itself, not something a project's instructions can override.

Possible approaches (not prescriptive)

• i18n resource files bundled with the CLI, selected via $LANG/locale or a config option
• A settings.json key to override/translate specific command descriptions