return json for anime list

app/routers/animeguess.py

@@ -164,6 +164,6 @@ async def ag_list():
         if obj.key.endswith("metadata.json"):
             metadata_file = obj.get()['Body'].read()
             metadata = json.loads(metadata_file)
-            anime_titles.append(metadata['answer'])
+            anime_titles.append({'title': f'{metadata["answer"]} [{metadata["eng_title"]}]'})
 
-    return json.dumps(anime_titles)
+    return anime_titles