Add contact, privacy, and terms pages with localization support

- Implemented contact page with form submission functionality and email integration.
- Created privacy and terms pages with structured content and localization.
- Updated English and French localization files to include new strings for contact, privacy, and terms.
- Enhanced About page with detailed sections on mission, technology, security, and tools offered.

frontend/src/components/layout/Footer.tsx

@@ -93,6 +93,12 @@ export default function Footer() {
               >
                 {t('common.about')}
               </Link>
+              <Link
+                to="/contact"
+                className="text-sm text-slate-500 transition-colors hover:text-primary-600 dark:text-slate-400 dark:hover:text-primary-400"
+              >
+                {t('common.contact')}
+              </Link>
             </div>
           </div>
         </div>