Index: src/wp-admin/includes/ajax-actions.php
===================================================================
--- src/wp-admin/includes/ajax-actions.php	(revision 31750)
+++ src/wp-admin/includes/ajax-actions.php	(working copy)
@@ -2914,7 +2914,7 @@
 		$status['error'] = $result->get_error_message();
  		wp_send_json_error( $status );
 	} else if ( is_null( $result ) ) {
-		$status['errorCode'] = __( 'unable_to_connect_to_filesystem' );
+		$status['errorCode'] = 'unable_to_connect_to_filesystem';
 		$status['error'] = __( 'Unable to connect to the filesystem. Please confirm your credentials.' );
 		wp_send_json_error( $status );
 	}
@@ -2964,7 +2964,7 @@
 		$status['error'] = $result->get_error_message();
  		wp_send_json_error( $status );
 	} else if ( is_bool( $result ) && ! $result ) {
-		$status['errorCode'] = __( 'unable_to_connect_to_filesystem' );
+		$status['errorCode'] = 'unable_to_connect_to_filesystem';
 		$status['error'] = __( 'Unable to connect to the filesystem. Please confirm your credentials.' );
 		wp_send_json_error( $status );
 	}