use a fixed import for canvg

dist/editor/system/extensions/ext-locale/polygon/en.js

@@ -1,23 +0,0 @@
-System.register([], function (exports) {
-  'use strict';
-  return {
-    execute: function () {
-
-      var en = exports('default', {
-        name: 'polygon',
-        buttons: [
-          {
-            title: 'Polygon Tool'
-          }
-        ],
-        contextTools: [
-          {
-            title: 'Number of Sides',
-            label: 'sides'
-          }
-        ]
-      });
-
-    }
-  };
-});

dist/editor/system/extensions/ext-locale/polygon/zh_CN.js

@@ -1,23 +0,0 @@
-System.register([], function (exports) {
-  'use strict';
-  return {
-    execute: function () {
-
-      var zhCN = exports('default', {
-        name: '多边形',
-        buttons: [
-          {
-            title: '多边形工具'
-          }
-        ],
-        contextTools: [
-          {
-            title: '边数',
-            label: '边数'
-          }
-        ]
-      });
-
-    }
-  };
-});