Media Grid: add screen reader text in a subview on the toolbar, a media.view.Label instance before media.view.DateFilter.

See #29026.


git-svn-id: https://develop.svn.wordpress.org/trunk@29435 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/media.php

@@ -2940,6 +2940,7 @@ function wp_enqueue_media( $args = array() ) {
 		'bulkActionsLabel'       => __( 'Select bulk action' ),
 		'deletePermanently'      => __( 'Delete Permanently' ),
 		'apply'                  => __( 'Apply' ),
+		'filterByDate'           => __( 'Filter by date' ),
 
 		// Library Details
 		'attachmentDetails'  => __( 'Attachment Details' ),