Change Korean language words from Chinese characters to Hangul (#519)

* Update i18n.json

Change Korean language words from Chinese characters to Hangul

* Update i18n.json

Change Korean language words from Chinese characters to Hangul

app/i18n.json

@@ -6,5 +6,5 @@
   "es": "Es",
   "ru_RU": "Ru",
   "vi_VN": "Vi",
-  "ko_KR": "韓"
+  "ko_KR": "한글"
 }