Run grunt update, see phetsims/chipper#1148

equality-explorer_en.html

@@ -135,7 +135,7 @@
 
   // Module loading in compilation-free (development) mode will be kicked off once strings are loaded.
   // This is done in load-unbuilt-strings.js
-  window.phet.chipper.loadModules = () => loadURL( 'js/equality-explorer-main.js', 'module' );
+  window.phet.chipper.loadModules = () => loadURL( '../chipper/dist/equality-explorer/js/equality-explorer-main.js', 'module' );
 </script>
 </body>
 </html>

js/equalityExplorerStrings.ts

@@ -0,0 +1,45 @@
+// Copyright 2020-2021, University of Colorado Boulder
+
+/**
+ * Auto-generated from modulify, DO NOT manually modify.
+ */
+/* eslint-disable */
+import getStringModule from '../../chipper/js/getStringModule.js';
+import equalityExplorer from './equalityExplorer.js';
+
+type StringsType = {
+  'equality-explorer': {
+    'title': string
+  },
+  'screen': {
+    'basics': string,
+    'numbers': string,
+    'variables': string,
+    'operations': string,
+    'solveIt': string
+  },
+  'snapshots': string,
+  'equationOrInequality': string,
+  'variable': string,
+  'variables': string,
+  'x': string,
+  'questionMark': string,
+  'chooseYourLevel': string,
+  'solveFor': string,
+  'levels': string,
+  'level1Description': string,
+  'level2Description': string,
+  'level3Description': string,
+  'level4Description': string,
+  'level5Description': string,
+  'next': string,
+  'numberTooBig': string,
+  'leftSideFull': string,
+  'rightSideFull': string
+};
+
+const equalityExplorerStrings = getStringModule( 'EQUALITY_EXPLORER' ) as StringsType;
+
+equalityExplorer.register( 'equalityExplorerStrings', equalityExplorerStrings );
+
+export default equalityExplorerStrings;