TF-1677: Fix validation for email forward

(cherry picked from commit b8741e08799c84ff96fd349d264f00d6b71e08cc)

lib/main/localizations/app_localizations.dart

@@ -2827,4 +2827,10 @@ class AppLocalizations {
       name: 'mailboxVisibilitySubtitle',
     );
   }
+
+  String get emptyListEmailForward {
+    return Intl.message(
+      'Please input at least one recipient',
+      name: 'emptyListEmailForward');
+  }
 }