Revert "hacks for google translate"

This reverts commit 97f5a9eece8db6684f243a265a1502d1eff7d367.

threejs/lessons/resources/threejs-lesson-utils.js

@@ -97,12 +97,7 @@ export const threejsLessonUtils = {
         if (entry.isIntersecting) {
           this.elementsOnScreen.add(entry.target);
         } else {
-          // Google Translate overrides the Set class!
-          if (this.elementsOnScreen.delete) {
-            this.elementsOnScreen.delete(entry.target);
-          } else if (this.elementsOnScreen.remove) {
-            this.elementsOnScreen.remove(entry.target);
-          }
+          this.elementsOnScreen.delete(entry.target);
         }
         // Each entry describes an intersection change for one observed
         // target element:

threejs/lessons/resources/threejs-primitives.js

@@ -744,9 +744,6 @@ const geometry = new THREE.WireframeGeometry(
       throw new Error(`no primitive ${name}`);
     }
 
-    base.classList.add('notranslate');
-    base.setAttribute('translate', 'no');
-
     const text = base.innerHTML;
     base.innerHTML = '';