feat: update i18n configuration to prioritize browser language; enhance language detection
feat: add new translation keys for form submission feedback in English and German
- Added Tailwind CSS and related packages to the project.
- Refactored App.css and index.css to use Tailwind for styling.
- Enhanced MainForm component with improved form handling, validation, and layout using Material-UI and Tailwind CSS.
- Implemented dynamic error handling and submission feedback.
- Created a new Tailwind configuration file.