Aşağıdaki kodu theme dosyanıza yapıştırarak kullanılamayan linkleri menüden kaldırılır. 

function TemaAdı_preprocess_menu(&$variables) {
  if ($variables['menu_name'] == 'ekonomi') {
    $language = Drupal::languageManager()->getCurrentLanguage(LanguageInterface::TYPE_CONTENT)->getId();
    foreach ($variables['items'] as $key => $item) {
      if(!$variables['items'][$key] = TemaAdı_checkForMenuItemTranslation($item, $language)) {
        unset($variables['items'][$key]);
      }
    }
  }
}

 

function TemaAdı_checkForMenuItemTranslation($item, $language) {
  $menuLinkEntity = TemaAdı_load_link_entity_by_link($item['original_link']);

  if ($menuLinkEntity != NULL) {
    $languages = $menuLinkEntity->getTranslationLanguages();
    // Remove links which is not translated to current language.
    if (!array_key_exists($language, $languages)) {
      return false;
    } else {
      if(count($item['below']) > 0) {
        foreach ($item['below'] as $subkey => $subitem) {
          if(!$item['below'][$subkey] = TemaAdı_checkForMenuItemTranslation($subitem, $language)) {
            unset($item['below'][$subkey]);
          }
        }
      }
      return $item;
    }

  }
}

function TemaAdı_load_link_entity_by_link(MenuLinkInterface $menuLinkContentPlugin) {
  $entity = NULL;
  if ($menuLinkContentPlugin instanceof MenuLinkContent) {
    list($entity_type, $uuid) = explode(':', $menuLinkContentPlugin->getPluginId(), 2);
    $entity = \Drupal::entityManager()->loadEntityByUuid($entity_type, $uuid);
  }
  return $entity;
}

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