Show translation diagnostics in admin

public/admin.js

@@ -591,9 +591,47 @@ function renderActive() {
       ${renderAttachments(message.attachments)}
     </article>
   `).join("") + adminReadReceipt(conversation, messages);
+  decorateTranslationMeta(messages);
   $("#messages").scrollTop = $("#messages").scrollHeight;
 }
 
+function decorateTranslationMeta(messages) {
+  document.querySelectorAll("#messages .message .by").forEach((element, index) => {
+    const meta = translationMeta(messages[index]);
+    if (!meta) return;
+    const badge = document.createElement("span");
+    badge.className = `translation-meta ${meta.status}`;
+    badge.textContent = meta.label;
+    if (meta.error) badge.title = meta.error;
+    element.append(" ");
+    element.append(badge);
+  });
+}
+
+function translationMeta(message) {
+  if (!message?.translationStatus) return null;
+  const status = String(message.translationStatus || "");
+  const source = String(message.originalLanguage || "?").toUpperCase();
+  const target = String(message.translatedLanguage || "?").toUpperCase();
+  return {
+    status,
+    error: message.translationError || "",
+    label: translationStatusLabel(status, source, target)
+  };
+}
+
+function translationStatusLabel(status, source, target) {
+  if (status === "translated") return `preklad: ${source} -> ${target}`;
+  if (status === "same_language") return `preklad: ${source} = ${target}`;
+  if (status === "failed") return `preklad: ${source} -> ${target} - chyba`;
+  if (status === "missing_key") return "preklad: chybi klic";
+  if (status === "disabled") return "preklad: vypnuto";
+  if (status === "empty") return `preklad: ${source} -> ${target} - prazdny`;
+  if (status === "skipped") return "preklad: preskoceno";
+  if (status === "pending") return "preklad: ceka";
+  return `preklad: ${status}`;
+}
+
 function renderMessageBody(message) {
   const original = message.body ? `<p>${escapeHtml(message.body)}</p>` : "";
   if (!message.translatedBody) return original;