Ticket #44237: 44237-duplicate.diff

src/wp-includes/comment.php

@@ -698 +698 @@
                  * @param array $commentdata Comment data.
                  */
                 do_action( 'comment_duplicate_trigger', $commentdata );
+
+                $duplicate_message = __( 'Duplicate comment detected; it looks as though you’ve already said that!' );
+
+                /**
+                 * Filters duplicate comment message.
+                 *
+                 * @since 5.0
+                 *
+                 * @param string $duplicate_text Duplicate text message.
+                 */
+                $duplicate_message = apply_filters( 'comment_duplicate_message', $duplicate_message );
+
                 if ( true === $avoid_die ) {
-                        return new WP_Error( 'comment_duplicate', __( 'Duplicate comment detected; it looks as though you’ve already said that!' ), 409 );
+                        return new WP_Error( 'comment_duplicate', $duplicate_message, 409 );
                 } else {
                         if ( wp_doing_ajax() ) {
-                                die( __( 'Duplicate comment detected; it looks as though you’ve already said that!' ) );
+                                die( $duplicate_message );
                         }
 
-                        wp_die( __( 'Duplicate comment detected; it looks as though you’ve already said that!' ), 409 );
+                        wp_die( $duplicate_message, 409 );
                 }
         }