Issue 3501 - fix typo in the code for the title for plugin NotificationWindow

src/plugin/PluginClass.cpp

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 1540 matching lines @@
       std::wstring upToDateText = dictionary->Lookup("updater", "update-already-up-to-date-text");
       std::wstring upToDateTitle = dictionary->Lookup("updater", "update-already-up-to-date-title");
       pClass->notificationMessage.SetTextAndIcon(upToDateText, upToDateTitle, TTI_INFO);
     }
     break;
   case WM_UPDATE_CHECK_ERROR:
     {
       Dictionary* dictionary = Dictionary::GetInstance();
       std::wstring errorText = dictionary->Lookup("updater", "update-error-text");
       std::wstring errorTitle = dictionary->Lookup("updater", "update-error-title");
-      pClass->notificationMessage.SetTextAndIcon(errorText, errorText, TTI_ERROR);
+      pClass->notificationMessage.SetTextAndIcon(errorText, errorTitle, TTI_ERROR);
     }
     break;
   case WM_DOWNLOADING_UPDATE:
     {
       Dictionary* dictionary = Dictionary::GetInstance();
       std::wstring downloadingText = dictionary->Lookup("updater", "downloading-update-text");
       std::wstring downloadingTitle = dictionary->Lookup("updater", "downloading-update-title");
       pClass->notificationMessage.SetTextAndIcon(downloadingText, downloadingTitle, TTI_INFO);
     }
     break;
@@ skipping 61 matching lines @@
   s_criticalSectionLocal.Unlock();
 
   return icon;
 }
 
 ATOM CPluginClass::GetAtomPaneClass()
 {
   return s_atomPaneClass;
 }