Sandbox changes for use in UXR prototype.

- "All Set" screen doesn't show after Home/Overview/Back tutorials.
 - X button in top left is hidden (we'll want to move this to the
   feedback view).
 - Feedback pops in and out from the top of the screen.
 - Hand animation is replaced by video feedback at start and after
   incorrect gesture.
 - Back tutorial goes left then right, in order to match video.
 - Updated strings and marked translatable (UX-reviewed already).
 - Added Chinese translations.
 - Many other things.

Test: Manual
Change-Id: I126a3ea0dad645014fab9cdee2ed19e06a8a56e9

quickstep/src/com/android/quickstep/interaction/AssistantGestureTutorialFragment.java

@@ -18,16 +18,10 @@ package com.android.quickstep.interaction;
 import android.view.MotionEvent;
 import android.view.View;
 
-import com.android.launcher3.R;
 import com.android.quickstep.interaction.TutorialController.TutorialType;
 
 /** Shows the Home gesture interactive tutorial. */
 public class AssistantGestureTutorialFragment extends TutorialFragment {
-    @Override
-    Integer getHandAnimationResId() {
-        return R.drawable.assistant_gesture;
-    }
-
     @Override
     TutorialController createController(TutorialType type) {
         return new AssistantGestureTutorialController(this, type);