Clarify widget save translation action

public/admin.js

@@ -493,7 +493,18 @@ function widgetCopyForAdmin(settings, language) {
     placeholder: settings.placeholder?.[lang],
     sendLabel: settings.sendLabel?.[lang]
   };
-  return { ...defaultWidgetCopy(lang), ...legacy, ...copy };
+  return normalizeWidgetCopyForAdmin({ ...defaultWidgetCopy(lang), ...legacy, ...copy }, lang);
+}
+
+function normalizeWidgetCopyForAdmin(copy, language) {
+  if (language !== "cs") return copy;
+  const defaults = defaultWidgetCopy("cs");
+  const legacy = legacyCzechWidgetCopy();
+  const normalized = { ...copy };
+  for (const field of Object.keys(legacy)) {
+    if (normalized[field] === legacy[field]) normalized[field] = defaults[field];
+  }
+  return normalized;
 }
 
 function defaultWidgetCopy(language) {
@@ -525,6 +536,21 @@ function defaultWidgetCopy(language) {
   };
 }
 
+function legacyCzechWidgetCopy() {
+  return {
+    title: "Potrebujete poradit?",
+    intro: "Napiste nam. Odpovime co nejdrive.",
+    offlineIntro: "Ted nejsme online, ale zpravu nam muzete nechat.",
+    placeholder: "Napiste zpravu...",
+    sendLabel: "Odeslat",
+    dropzoneLabel: "Pridat fotku nebo pretahnout",
+    onlineLabel: "Jsme online",
+    newReplyLabel: "Nova odpoved",
+    infoText: "Zpravu a technicke udaje relace zpracujeme jen pro odpoved na vas dotaz.",
+    operatorReplyLabel: "odpovida"
+  };
+}
+
 function syncLegacyWidgetCopy(settings) {
   settings.title = settings.title || {};
   settings.intro = settings.intro || {};