added italian language to locales folder

[KadenTheHero]

📖 Description

Added italian language to locales folder

🔗 Related Issues

• Fixes # (issue number)
• Closes # (issue number)

🛠️ Proposed Changes

Briefly list the file modifications and new modules:

• Frontend: e.g., Updated note sharing styles
• Backend / API: e.g., Refactored cron route early returns
• Database / Schema: e.g., Added hasFcmToken validator rule

✅ Contribution Checklist

• [V] My code follows the project's coding standards and style guidelines.
• [ V] I have verified all modifications compile cleanly without warnings.
• [ V] I have written unit/integration tests covering the new logic (or adjusted existing tests).
• [ V] All existing and new automated tests passed successfully (npm run test / npm run test:internal).
• [ V] I have verified the changes locally using the Firebase Emulator suite and the seeder script.
• [V ] I have updated corresponding documentation in docs/ and docs/ja/ (if applicable).

🧪 How to Test

Detail the precise steps required to verify your contribution:

1. Start the local emulator: npx firebase emulators:start
2. Seed the sandbox: npm run db:seed
3. Run internal API integrations: npm run test:internal
4. Confirm expected behavior: Describe the specific behavior to watch for.

📸 Screenshots / Visual Demos

If your change impacts the user interface, please attach screenshots, recordings, or visual walk-throughs below:

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