fix(i18n): ensure contact modal displays in correct language when opened

Fixed issue where clicking "Kontakt" in German mode showed English contact form.

Changes:
- Re-apply translations when modal opens (ensures current language is used)
- Use translated "submitting" text for sending state (DE: "Senden...", FR: "Envoi en cours...")
- Use translated submit button text when re-enabled
- Remove duplicate success message text

Now clicking "Kontakt" in DE mode or "Nous contacter" in FR mode correctly shows the modal in that language.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

public/js/components/footer.js

@@ -175,7 +175,7 @@
 
                 <!-- Success Message -->
                 <div id="contact-success" class="hidden bg-green-50 border border-green-200 text-green-800 px-4 py-3 rounded">
-                  <span data-i18n="contact_modal.success_message">Thank you for contacting us! We will respond within 24 hours.</span>! We'll respond within 24 hours.
+                  <span data-i18n="contact_modal.success_message">Thank you for contacting us! We will respond within 24 hours.</span>
                 </div>
 
                 <!-- Error Message -->
@@ -268,6 +268,10 @@
 
       const openModal = () => {
         modal.classList.remove('hidden');
+        // Re-apply translations to modal when opening
+        if (window.I18n && window.I18n.applyTranslations) {
+          window.I18n.applyTranslations();
+        }
         document.getElementById('contact-name')?.focus();
       };
 
@@ -313,7 +317,9 @@
 
         // Disable submit button
         submitBtn.disabled = true;
-        submitBtn.textContent = 'Sending...';
+        // Use translation if available, fallback to English
+        const sendingText = window.I18n?.translations?.contact_modal?.submitting || 'Sending...';
+        submitBtn.textContent = sendingText;
 
         try {
           // Get CSRF token from cookie
@@ -354,7 +360,9 @@
         } finally {
           // Re-enable submit button
           submitBtn.disabled = false;
-          submitBtn.textContent = 'Send Message';
+          // Use translation if available, fallback to English
+          const submitText = window.I18n?.translations?.contact_modal?.submit_button || 'Send Message';
+          submitBtn.textContent = submitText;
         }
       });
     }