Add backward move to lance; fix variable name; rearrange challenge list columns.

www/js/game.js

@@ -682,6 +682,7 @@ GAME.Const = {
             new GAME.PieceMovement()
                 .add(0)
                 .add(1)
+                .add(3)
                 .add(5),
             new GAME.PieceMovement()
                 .add(0)

www/js/scene.js

@@ -838,14 +838,14 @@ const SCENES = {
                             buttons.push(UI.button(LANG("decline"), callback_decline));
 
                             rows.push([
+                                UI.text(data.challenges[r].handle),
                                 UI.text(LANG("unranked")),
-                                UI.text(data.users[r].handle),
                                 buttons,
                             ]);
                         }
 
                         let tbody = UI.table_content(
-                            [ LANG("rank"), LANG("handle"), "" ],
+                            [ LANG("handle"), LANG("rank"), "" ],
                             rows,
                         );