Administration: Switch core post type labels to add_new_item.

In [56515], the default value of `Add New` was changed to "Add New Post / Add New Page". This caused problems with post types where `add_new` was not declared.

Change core usage to reference the `add_new_item` value and revert the default value of `add_new` back to "Add New / Add New". This retains the accessibility advantages without creating counter intuitive usage of the `add_new` key.

With this change, post types registered with no `add_new` key will be unimpacted in core, and post types registered with no `add_new_item` key will use the default "Add New Post", which is not a change from the current state.

Props smerriman, afercia, rcreators, joedolson, eclev91, johnbillion.
Fixes #60045.

git-svn-id: https://develop.svn.wordpress.org/trunk@59161 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/edit-form-advanced.php

@@ -434,7 +434,7 @@
 
 <?php
 if ( isset( $post_new_file ) && current_user_can( $post_type_object->cap->create_posts ) ) {
-	echo ' <a href="' . esc_url( admin_url( $post_new_file ) ) . '" class="page-title-action">' . esc_html( $post_type_object->labels->add_new ) . '</a>';
+	echo ' <a href="' . esc_url( admin_url( $post_new_file ) ) . '" class="page-title-action">' . esc_html( $post_type_object->labels->add_new_item ) . '</a>';
 }
 ?>
 

src/wp-admin/edit.php

@@ -419,7 +419,7 @@
 
 <?php
 if ( current_user_can( $post_type_object->cap->create_posts ) ) {
-	echo ' <a href="' . esc_url( admin_url( $post_new_file ) ) . '" class="page-title-action">' . esc_html( $post_type_object->labels->add_new ) . '</a>';
+	echo ' <a href="' . esc_url( admin_url( $post_new_file ) ) . '" class="page-title-action">' . esc_html( $post_type_object->labels->add_new_item ) . '</a>';
 }
 
 if ( isset( $_REQUEST['s'] ) && strlen( $_REQUEST['s'] ) ) {

src/wp-admin/menu.php

@@ -169,7 +169,7 @@
 
 	$menu[ $ptype_menu_position ] = array( esc_attr( $ptype_obj->labels->menu_name ), $ptype_obj->cap->edit_posts, $ptype_file, '', $menu_class, $ptype_menu_id, $menu_icon );
 	$submenu[ $ptype_file ][5]    = array( $ptype_obj->labels->all_items, $ptype_obj->cap->edit_posts, $ptype_file );
-	$submenu[ $ptype_file ][10]   = array( $ptype_obj->labels->add_new, $ptype_obj->cap->create_posts, $post_new_file );
+	$submenu[ $ptype_file ][10]   = array( $ptype_obj->labels->add_new_item, $ptype_obj->cap->create_posts, $post_new_file );
 
 	$i = 15;
 	foreach ( get_taxonomies( array(), 'objects' ) as $tax ) {

src/wp-includes/class-wp-post-type.php

@@ -973,7 +973,7 @@ public static function get_default_labels() {
 		self::$default_labels = array(
 			'name'                     => array( _x( 'Posts', 'post type general name' ), _x( 'Pages', 'post type general name' ) ),
 			'singular_name'            => array( _x( 'Post', 'post type singular name' ), _x( 'Page', 'post type singular name' ) ),
-			'add_new'                  => array( __( 'Add New Post' ), __( 'Add New Page' ) ),
+			'add_new'                  => array( __( 'Add New' ), __( 'Add New' ) ),
 			'add_new_item'             => array( __( 'Add New Post' ), __( 'Add New Page' ) ),
 			'edit_item'                => array( __( 'Edit Post' ), __( 'Edit Page' ) ),
 			'new_item'                 => array( __( 'New Post' ), __( 'New Page' ) ),

src/wp-includes/post.php

@@ -2022,7 +2022,7 @@ function _post_type_meta_capabilities( $capabilities = null ) {
  * - `name` - General name for the post type, usually plural. The same and overridden
  *          by `$post_type_object->label`. Default is 'Posts' / 'Pages'.
  * - `singular_name` - Name for one object of this post type. Default is 'Post' / 'Page'.
- * - `add_new` - Label for adding a new item. Default is 'Add New Post' / 'Add New Page'.
+ * - `add_new` - Label for adding a new item. Default is 'Add New' / 'Add New'.
  * - `add_new_item` - Label for adding a new singular item. Default is 'Add New Post' / 'Add New Page'.
  * - `edit_item` - Label for editing a singular item. Default is 'Edit Post' / 'Edit Page'.
  * - `new_item` - Label for the new item page title. Default is 'New Post' / 'New Page'.
@@ -2084,6 +2084,8 @@ function _post_type_meta_capabilities( $capabilities = null ) {
  * @since 6.4.0 Changed default values for the `add_new` label to include the type of content.
  *              This matches `add_new_item` and provides more context for better accessibility.
  * @since 6.6.0 Added the `template_name` label.
+ * @since 6.7.0 Restored pre-6.4.0 defaults for the `add_new` label and updated documentation.
+ *              Updated core usage to reference `add_new_item`.
  *
  * @access private
  *