fix: Resolve home page latency, add robust language validation and testimonial fallback

app/templates/home/index.html

@@ -80,31 +80,48 @@
 
 {% block extra_js %}
 <script>
-let testimonials = [];
-let currentIndex = 0;
+  let testimonials = [];
+  let currentIndex = 0;
 
-fetch('/static/data/testimonials.{{ lang }}.json')
-  .then(res => res.json())
-  .then(data => {
-    testimonials = data;
-    showTestimonial(0);
-    setInterval(nextTestimonial, 8000);
-  });
+  fetch('/static/data/testimonials.{{ lang }}.json')
+    .then(res => {
+      if (!res.ok) throw new Error("Testimonials not found");
+      return res.json();
+    })
+    .then(data => {
+      testimonials = data;
+      showTestimonial(0);
+      setInterval(nextTestimonial, 8000);
+    })
+    .catch(err => {
+      console.warn("Testimonials load failed for '{{ lang }}':", err);
+      // Fallback to German
+      if ("{{ lang }}" !== "de") {
+        fetch('/static/data/testimonials.de.json')
+          .then(res => res.json())
+          .then(data => {
+            testimonials = data;
+            showTestimonial(0);
+            setInterval(nextTestimonial, 8000);
+          })
+          .catch(e => console.error("Fallback testimonials failed:", e));
+      }
+    });
 
-function showTestimonial(index) {
-  const t = testimonials[index];
-  document.getElementById('testimonial-text').textContent = `"${t.message}"`;
-  document.getElementById('testimonial-author').textContent = `– ${t.author}, ${t.role}`;
-}
+  function showTestimonial(index) {
+    const t = testimonials[index];
+    document.getElementById('testimonial-text').textContent = `"${t.message}"`;
+    document.getElementById('testimonial-author').textContent = `– ${t.author}, ${t.role}`;
+  }
 
-function nextTestimonial() {
-  currentIndex = (currentIndex + 1) % testimonials.length;
-  showTestimonial(currentIndex);
-}
+  function nextTestimonial() {
+    currentIndex = (currentIndex + 1) % testimonials.length;
+    showTestimonial(currentIndex);
+  }
 
-function prevTestimonial() {
-  currentIndex = (currentIndex - 1 + testimonials.length) % testimonials.length;
-  showTestimonial(currentIndex);
-}
+  function prevTestimonial() {
+    currentIndex = (currentIndex - 1 + testimonials.length) % testimonials.length;
+    showTestimonial(currentIndex);
+  }
 </script>
-{% endblock %}
+{% endblock %}