Posts, Post Types: Change "Featured Image" post label to use sentence case: "Featured image".

This makes it more consistent with other UI elements in the block editor.

Props mcsf.
Fixes #49371.

git-svn-id: https://develop.svn.wordpress.org/trunk@47194 602fd350-edb4-49c9-b593-d223f7449a82

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

@@ -376,7 +376,7 @@ if ( 'post' == $post_type ) {
 
 	if ( current_theme_supports( 'post-thumbnails' ) && post_type_supports( 'post', 'thumbnail' ) ) {
 		$publish_box .= '<li>' . sprintf(
-			/* translators: %s: Featured Image. */
+			/* translators: %s: Featured image. */
 			__( '<strong>%s</strong> &mdash; This allows you to associate an image with your post without inserting it. This is usually useful only if your theme makes use of the image as a post thumbnail on the home page, a custom header, etc.' ),
 			esc_html( $post_type_object->labels->featured_image )
 		) . '</li>';

src/wp-admin/includes/post.php

@@ -1517,7 +1517,7 @@ function _wp_post_thumbnail_html( $thumbnail_id = null, $post = null ) {
 		$size = isset( $_wp_additional_image_sizes['post-thumbnail'] ) ? 'post-thumbnail' : array( 266, 266 );
 
 		/**
-		 * Filters the size used to display the post thumbnail image in the 'Featured Image' meta box.
+		 * Filters the size used to display the post thumbnail image in the 'Featured image' meta box.
 		 *
 		 * Note: When a theme adds 'post-thumbnail' support, a special 'post-thumbnail'
 		 * image size is registered, which differs from the 'thumbnail' image size

src/wp-includes/post.php

@@ -1646,7 +1646,7 @@ function _post_type_meta_capabilities( $capabilities = null ) {
  * - `insert_into_item` - Label for the media frame button. Default is 'Insert into post' / 'Insert into page'.
  * - `uploaded_to_this_item` - Label for the media frame filter. Default is 'Uploaded to this post' /
  *                           'Uploaded to this page'.
- * - `featured_image` - Label for the Featured Image meta box title. Default is 'Featured Image'.
+ * - `featured_image` - Label for the featured image meta box title. Default is 'Featured image'.
  * - `set_featured_image` - Label for setting the featured image. Default is 'Set featured image'.
  * - `remove_featured_image` - Label for removing the featured image. Default is 'Remove featured image'.
  * - `use_featured_image` - Label in the media frame for using a featured image. Default is 'Use as featured image'.
@@ -1704,7 +1704,7 @@ function get_post_type_labels( $post_type_object ) {
 		'attributes'               => array( __( 'Post Attributes' ), __( 'Page Attributes' ) ),
 		'insert_into_item'         => array( __( 'Insert into post' ), __( 'Insert into page' ) ),
 		'uploaded_to_this_item'    => array( __( 'Uploaded to this post' ), __( 'Uploaded to this page' ) ),
-		'featured_image'           => array( _x( 'Featured Image', 'post' ), _x( 'Featured Image', 'page' ) ),
+		'featured_image'           => array( _x( 'Featured image', 'post' ), _x( 'Featured image', 'page' ) ),
 		'set_featured_image'       => array( _x( 'Set featured image', 'post' ), _x( 'Set featured image', 'page' ) ),
 		'remove_featured_image'    => array( _x( 'Remove featured image', 'post' ), _x( 'Remove featured image', 'page' ) ),
 		'use_featured_image'       => array( _x( 'Use as featured image', 'post' ), _x( 'Use as featured image', 'page' ) ),