Duplicate "Pages" Item in Admin Menu

I’m registering the following post type:

register_post_type( 'post', array(
    'hierarchical' => true,
    'public'       => true
) );

Now I have duplicate “Pages” menu items in WordPress Admin Menu. It should be not “Pages” but rather “Posts”.

In older versions of WordPress ( < 4.4 ) everything was alright. Any suggestions to do the same? Most important is to make my posts hierarchical.