Fix hierarchy for products and attributes

includes/admin/class-wc-admin-attributes.php

@@ -428,7 +428,7 @@ class WC_Admin_Attributes {
 				<div id="col-left">
 					<div class="col-wrap">
 						<div class="form-wrap">
-							<h3><?php _e( 'Add New Attribute', 'woocommerce' ); ?></h3>
+							<h2><?php _e( 'Add New Attribute', 'woocommerce' ); ?></h2>
 							<p><?php _e( 'Attributes let you define extra product data, such as size or colour. You can use these attributes in the shop sidebar using the "layered nav" widgets. Please note: you cannot rename an attribute later on.', 'woocommerce' ); ?></p>
 							<form action="edit.php?post_type=product&amp;page=product_attributes" method="post">
 								<div class="form-field">

includes/class-wc-post-types.php

@@ -258,6 +258,9 @@ class WC_Post_types {
 							'use_featured_image'    => __( 'Use as product image', 'woocommerce' ),
 							'insert_into_item'      => __( 'Insert into product', 'woocommerce' ),
 							'uploaded_to_this_item' => __( 'Uploaded to this product', 'woocommerce' ),
+							'filter_items_list'     => __( 'Filter products', 'woocommerce' ),
+							'items_list_navigation' => __( 'Products navigation', 'woocommerce' ),
+							'items_list'            => __( 'Products list', 'woocommerce' ),
 						),
 					'description'         => __( 'This is where you can add new products to your store.', 'woocommerce' ),
 					'public'              => true,