Update ko.yml (#449)

I modified a little.

languages/ko.yml

@@ -22,16 +22,16 @@ widget:
 article:
     more: '자세히 보기'
     comments: '댓글'
-    read: 'read'
+    read: '읽기'
-    about: 'About'
+    about: '나에 대하여'
-    words: 'words'
+    words: '단어'
 search:
-    search: 'Search'
+    search: '검색'
-    hint: 'Type something...'
+    hint: '입력 하세요...'
 insight:
-    hint: 'Type something...'
+    hint: '입력 하세요...'
     posts: '포스트'
-    pages: 'Pages'
+    pages: '페이지'
     categories: '카테고리'
     tags: '태그'
-    untitled: '(Untitled)'
+    untitled: '(제목없음)'