update kr option to ko on quiz-app

quiz-app/src/App.vue

@@ -6,7 +6,7 @@
       <select v-model="locale">
         <option>en</option>
         <option>fr</option>
-        <option>kr</option>
+        <option>ko</option>
       </select>
     </nav>
     <div id="app">

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

@@ -1,14 +1,14 @@
 // index.js
 import en from './en.json';
 import fr from './fr.json';
-import kr from './kr.json';
+import ko from './ko.json';
 
 //export const defaultLocale = 'en';
 
 const messages = {
 	en: en[0],
 	fr: fr[0],
-	kr: kr[0],
+	ko: ko[0],
 };
 
 export default messages;