use username for multi games

public/static/js/game.js

@@ -231,17 +231,6 @@ const GameType = Object.freeze({ 'SINGLE': 0, 'MULTI': 1, 'CHALLENGE': 2 });
 
         prepare: function () {
             var data = new FormData();
-            var userNames;
-
-            if (roomId) {
-                var userNames = localStorage.userNames ? JSON.parse(localStorage.userNames) : {};
-                if (!userNames.hasOwnProperty(roomId)) {
-                    userNames[roomId] = prompt('Your name: ');
-                    localStorage.userNames = JSON.stringify(userNames);
-                }
-
-                data.append('userName', userNames[roomId]);
-            }
 
             document.getElementById('loading').style.visibility = 'visible';
             var url = Game.getGameIdentifier() + '/prepare.json';
@@ -618,7 +607,7 @@ const GameType = Object.freeze({ 'SINGLE': 0, 'MULTI': 1, 'CHALLENGE': 2 });
                     break;
 
                 case 'anonymous_user':
-                    MapGuesser.showModalWithContent('Error', 'You have to login to join a challenge!');
+                    MapGuesser.showModalWithContent('Error', 'You have to login to join this game!');
                     break;
 
                 default:

public/static/js/maps.js

@@ -131,11 +131,13 @@
         }, formData);
     };
 
-    document.getElementById('multiButton').onclick = function () {
-        MapGuesser.showModal('multi');
-        document.getElementById('createNewRoomButton').href = '/multiGame/new/' + this.dataset.mapId;
-        document.getElementById('multiForm').elements.roomId.select();
-        document.getElementById('playMode').style.visibility = 'hidden';
+    if (document.getElementById('multiButton')) {
+        document.getElementById('multiButton').onclick = function () {
+            MapGuesser.showModal('multi');
+            document.getElementById('createNewRoomButton').href = '/multiGame/new/' + this.dataset.mapId;
+            document.getElementById('multiForm').elements.roomId.select();
+            document.getElementById('playMode').style.visibility = 'hidden';
+        }
     }
 
     if (document.getElementById('challengeButton')) {