//Create photo album
add_action( 'init', 'create_taxonomies' );
function create_taxonomies() {
    $cat_labels = array(
        'name' => __( 'Albums', 'fotos' ),
        'singular_name' => __( 'Album', 'fotos' ),
        'search_items' =>  __( 'Search Albums', 'fotos' ),
        'all_items' => __( 'All Albums', 'fotos' ),
        'parent_item' => __( 'Parent Album', 'fotos' ),
        'parent_item_colon' => __( 'Parent Album:', 'fotos' ),
        'edit_item' => __( 'Edit Album', 'fotos' ),
        'update_item' => __( 'Update Album', 'fotos' ),
        'add_new_item' => __( 'Add New Album', 'fotos' ),
        'new_item_name' => __( 'New Album Name', 'fotos' ),
        'choose_from_most_used' => __( 'Choose from the most used photos albums', 'fotos' )
    );

    register_taxonomy('album_cats','photos',array(
        'hierarchical' => true,
        'labels' => $cat_labels,
        'query_var' => true,
        'rewrite' => array( 'slug' => 'album' ),
    ));
}