/**
  * Renders an install link
  *
  * @param string $extension
  * @return string the rendered a tag
  */
 public function render($extension)
 {
     $requiredExtensions = \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::getRequiredExtensionListArray();
     // Required extensions can't be activated or deactivated
     if (in_array($extension['key'], $requiredExtensions)) {
         return '';
     }
     $uriBuilder = $this->controllerContext->getUriBuilder();
     $action = 'toggleExtensionInstallationState';
     $uri = $uriBuilder->reset()->uriFor($action, array('extension' => $extension['key']), 'Action');
     $this->tag->addAttribute('href', $uri);
     $label = $extension['installed'] ? 'deactivate' : 'activate';
     $this->tag->addAttribute('title', \TYPO3\CMS\Extbase\Utility\LocalizationUtility::translate('extensionList.' . $label, 'extensionmanager'));
     $icon = $extension['installed'] ? 'uninstall' : 'install';
     $this->tag->setContent(\TYPO3\CMS\Backend\Utility\IconUtility::getSpriteIcon('actions-system-extension-' . $icon));
     return $this->tag->render();
 }