Add Korean.

src/locale/lang/ko.js

+export default {
+  el: {
+    datepicker: {
+      now: '지금',
+      today: '오늘',
+      cancel: '취소',
+      clear: '초기화',
+      confirm: '확인',
+      selectDate: '날짜 선택',
+      selectTime: '시간 선택',
+      startDate: '시작 날짜',
+      startTime: '시작 시간',
+      endDate: '종료 날짜',
+      endTime: '종료 시간',
+      year: '년',
+      month1: '1월',
+      month2: '2월',
+      month3: '3월',
+      month4: '4월',
+      month5: '5월',
+      month6: '6월',
+      month7: '7월',
+      month8: '8월',
+      month9: '9월',
+      month10: '10월',
+      month11: '11월',
+      month12: '12월',
+      // week: 'week',
+      weeks: {
+        sun: '일',
+        mon: '월',
+        tue: '화',
+        wed: '수',
+        thu: '목',
+        fri: '금',
+        sat: '토'
+      },
+      months: {
+        jan: '1월',
+        feb: '2월',
+        mar: '3월',
+        apr: '4월',
+        may: '5월',
+        jun: '6월',
+        jul: '7월',
+        aug: '8월',
+        sep: '9월',
+        oct: '10월',
+        nov: '11월',
+        dec: '12월'
+      }
+    },
+    select: {
+      loading: '불러오는 중',
+      noMatch: '맞는 데이터가 없습니다',
+      noData: '데이터 없음',
+      placeholder: '선택'
+    },
+    pagination: {
+      goto: '이동',
+      pagesize: '/page',
+      total: '총 {total}',
+      pageClassifier: ''
+    },
+    messagebox: {
+      title: '메시지',
+      confirm: '확인',
+      cancel: '취소',
+      error: '올바르지 않은 입력'
+    },
+    upload: {
+      delete: '삭제',
+      preview: '미리보기',
+      continue: '계속하기'
+    },
+    table: {
+      emptyText: '데이터 없음',
+      confirmFilter: '확인',
+      resetFilter: '초기화',
+      clearFilter: '전체'
+    },
+    tree: {
+      emptyText: '데이터 없음'
+    }
+  }
+};