Feature Request: Add localization/i18n support for UI messages

Feature Request

Description:
Add localization support for Claude Code UI messages (permission dialogs, confirmations, system messages).

Current behavior:
All system messages are hardcoded in English:

• "Allow Edit to file.js?"
• "Allow Bash command?"
• "Yes / No / Always allow"

Requested behavior:
Add ability to set preferred language in settings (or auto-detect from system locale).

Suggested languages (by demand):

• Russian (русский)
• Ukrainian (українська)
• Polish (polski)
• Spanish, German, French, Chinese, Japanese, etc.

Why this matters:
Claude Code is used globally. Non-English speakers would benefit from localized UI, especially for critical permission dialogs where understanding is important for security.

Possible implementation:

• Add locale setting in .claude/settings.json
• Use i18n library for message strings
• Fall back to English if translation unavailable