Improve: #368 error message when user has no public calendars (#412)

- Add translation key 'userDoesNotHavePublicCalendars' to all locale files (en, fr, vi, ru)
- Update ErrorSnackbar to support translation keys in error messages with params
- Update getTempCalendarsListAsync to throw error with translation key format instead of hardcoded message
- Error message now displays user-friendly translated text: '{User Name} does not have public calendars'

src/components/Error/ErrorSnackbar.tsx

@@ -20,6 +20,36 @@ export function ErrorSnackbar({
     dispatch(type === "calendar" ? calendarClearError() : userClearError());
   };
 
+  const getErrorMessage = () => {
+    if (!error) return t("error.unknown");
+
+    // Check if error message is a translation key with params
+    // Format: TRANSLATION:key|param1=value1|param2=value2
+    if (error.startsWith("TRANSLATION:")) {
+      const parts = error.substring(12).split("|");
+      const translationKey = parts[0];
+      const params: Record<string, string> = {};
+
+      for (let i = 1; i < parts.length; i++) {
+        const equalIndex = parts[i].indexOf("=");
+        if (equalIndex === -1) continue;
+        const key = parts[i].substring(0, equalIndex);
+        const value = parts[i].substring(equalIndex + 1);
+        if (key && value) {
+          try {
+            params[key] = decodeURIComponent(value);
+          } catch {
+            params[key] = value;
+          }
+        }
+      }
+
+      return t(translationKey, params);
+    }
+
+    return error;
+  };
+
   return (
     <Snackbar
       open={!!error}
@@ -36,7 +66,7 @@ export function ErrorSnackbar({
           </Button>
         }
       >
-        {error || t("error.unknown")}
+        {getErrorMessage()}
       </Alert>
     </Snackbar>
   );