Text Changes: Unify two more permission error messages.

Props ramiy.
Fixes #38158. See #34521.
Built from https://develop.svn.wordpress.org/trunk@38666


git-svn-id: http://core.svn.wordpress.org/trunk@38609 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/ajax-actions.php

@@ -2015,7 +2015,7 @@ function wp_ajax_upload_attachment() {
 			echo wp_json_encode( array(
 				'success' => false,
 				'data'    => array(
-					'message'  => __( "You don't have permission to attach files to this post." ),
+					'message'  => __( 'Sorry, you are not allowed to attach files to this post.' ),
 					'filename' => $_FILES['async-upload']['name'],
 				)
 			) );