code: public function addSlot($slotName, $blocks = array(), $username = null)
      {
          $pagesDir = $this->siteDir . '/pages/pages';
          $sitePages = $this->fetchPages($pagesDir);
          foreach ($sitePages as $pageName) {
              foreach ($this->siteInfo["languages"] as $languageName) {
                  $pageDir = $pagesDir . '/' . $pageName . '/' . $languageName . '/' . $slotName;
                  $this->generateSlot($pageDir, $blocks, $username);
              }
          }
      }
docs: {@inheritdoc}