feat(quiz-app): add spanish translation

quiz-app/src/App.vue

@@ -10,6 +10,7 @@
         <option>ja</option>
         <option value="ptbr">pt-br</option>
         <option>tr</option>
+        <option>es</option>
       </select>
     </nav>
     <div id="app">

quiz-app/src/assets/translations/index.js

@@ -5,6 +5,7 @@ import fr from './fr.json';
 import ja from './ja.json';
 import it from './it.json';
 import ptbr from './ptbr.json';
+import es from './es.json';
 
 //export const defaultLocale = 'en';
 
@@ -14,7 +15,8 @@ const messages = {
 	fr: fr[0],
 	ja: ja[0],
 	it: it[0],
-	ptbr: ptbr[0]
+	ptbr: ptbr[0],
+  es: es[0]
 };
 
 export default messages;