Implement hook_help()

+      $output .= '<h3>' . t('About') . '</h3>';
+      $output .= '<p>' . t('Provides a custom features to easily add the contents for node entity for all of the available language in a site.') . '</p>';

It's either Provides custom features or Provides a custom feature. Instead of that, it would be better to just say Allows to easily add […].
It's the content and for all the available languages.

Hi I changed the hook help please revise.