Overrides \Drupal\Core\Entity\EntityRenderController::alterBuild().
Overrides EntityRenderController::alterBuild
protected function alterBuild(array &$build, EntityInterface $entity, EntityDisplay $display, $view_mode, $langcode = NULL) {
parent::alterBuild($build, $entity, $display, $view_mode, $langcode);
$build['#attached']['css'][] = drupal_get_path('module', 'taxonomy') . '/css/taxonomy.module.css';
$build['#contextual_links']['taxonomy'] = array(
'taxonomy/term',
array(
$entity
->id(),
),
);
}