impr(quotes): add English quote (@FJOnori)

frontend/static/quotes/english.json

@@ -39345,6 +39345,12 @@
       "source": "Doctor Who, Fallen Heroes",
       "id": 7770,
       "length": 485
+    },
+    {
+      "text": "Life's but a walking shadow, a poor player that struts and frets his hour upon the stage, and then is heard no more. It is a tale told by an idiot, full of sound and fury, signifying nothing.",
+      "source": "Macbeth",
+      "id": 7771,
+      "length": 191
     }
   ]
 }