Index: wp-includes/class-wp-xmlrpc-server.php
===================================================================
--- wp-includes/class-wp-xmlrpc-server.php	(revision 39543)
+++ wp-includes/class-wp-xmlrpc-server.php	(working copy)
@@ -3605,7 +3605,7 @@
 		}
 
 		if ( ! $comment_ID ) {
-			return new IXR_Error( 403, __( 'An unknown error occurred' ) );
+			return new IXR_Error( 403, __( 'An unidentified error has occurred.' ) );
 		}
 
 		/**
Index: wp-includes/script-loader.php
===================================================================
--- wp-includes/script-loader.php	(revision 39543)
+++ wp-includes/script-loader.php	(working copy)
@@ -702,7 +702,7 @@
 				'activateImporter'           => __( 'Run Importer' ),
 				/* translators: %s: Importer name */
 				'activateImporterLabel'      => __( 'Run %s' ),
-				'unknownError'               => __( 'An unknown error occurred' ),
+				'unknownError'               => __( 'An unidentified error has occurred.' ),
 				'connectionError'            => __( 'Connection lost or the server is busy. Please try again later.' ),
 				'nonceError'                 => __( 'An error has occurred. Please reload the page and try again.' ),
 				'pluginsFound'               => __( 'Number of plugins found: %d' ),