fix: localize hardcoded alert() strings and fix GraphicsBlocks tests

Author: vanshika2720

js/blocks/__tests__/GraphicsBlocks.test.js

@@ -80,7 +80,9 @@ describe("GraphicsBlocks", () => {
         };
 
         activity = {
-            blocks: {},
+            blocks: {
+                blockList: {}
+            },
             errorMsg: jest.fn(),
             turtles: {
                 companionTurtle: jest.fn(() => 0),