Add i18n Foundation and Language Switch Placeholder in Home.jsx

Introduce a basic internationalization (i18n) setup for the app starting with Home.jsx.
This foundation will allow easy translation of UI text by using external JSON files (e.g., en.json, fr.json, etc.).
Add a simple language switch placeholder in the UI to prepare for future multilingual support.

🎯 Goals / Acceptance Criteria

Set up an i18n directory or folder structure for language files (/src/i18n/en.json).

Implement basic i18n configuration using a library like react-i18next or a custom hook.

Replace static text in Home.jsx with i18n translation keys.

Add a language switch placeholder (dropdown or button) in the header or footer.

Ensure default language is English (en).

Prepare the structure for adding more languages in future (e.g., fr.json, es.json).