feat: Translate frontend/src/i18n/en.json in ko

95% of minimum 50% translated source file: 'frontend/src/i18n/en.json'
on 'ko'.

Sync of partially translated files: 
untranslated content is included with an empty translation 
or source language content depending on file format

frontend/src/i18n/ko.json

@@ -142,7 +142,7 @@
     "uploadMessage": "업로드 옵션을 선택하세요.",
     "optionalPassword": "비밀번호 (선택)",
     "resolution": "해상도",
-    "discardEditorChanges": "Are you sure you wish to discard the changes you've made?"
+    "discardEditorChanges": "변경 사항을 취소하시겠습니까?"
   },
   "search": {
     "images": "이미지",