/**
  * initialize article edit page
  */
 protected function initializeEditPage()
 {
     $helper = new EditPageLayoutHelper();
     $editPage = $helper->setupEditPage($this->mEditedArticle, $this->fullScreen, get_class($this));
     //var used by onMakeGlobalVariablesScript in EditPageLayoutHelper
     if (!empty($this->titleNS)) {
         $helper->addJsVariable('wgEditedTitleNS', $this->contLang->getFormattedNsText($this->titleNS));
     } else {
         $helper->addJsVariable('wgEditedTitleNS', '');
     }
     $helper->addJsVariable('wgEditedTitlePrefix', $editPage->titlePrefix = $this->getTitlePrefix());
     if ($this->mode == self::MODE_NEW_SETUP) {
         $helper->addJsVariable('wgEditPageIsNewArticle', true);
     }
     return $editPage;
 }