Use proper string for Korean language

PR #15799.

src/base/unicodestrings.h

@@ -71,7 +71,7 @@ const char C_LOCALE_ICELANDIC[] = "Íslenska";
 const char C_LOCALE_INDONESIAN[] = "Bahasa Indonesia";
 const char C_LOCALE_ITALIAN[] = "Italiano";
 const char C_LOCALE_JAPANESE[] = "日本語";
-const char C_LOCALE_KOREAN[] = "한글";
+const char C_LOCALE_KOREAN[] = "한국어";
 const char C_LOCALE_LATGALIAN[] = "Latgalīšu volūda";
 const char C_LOCALE_LATVIAN[] = "Latviešu valoda";
 const char C_LOCALE_LITHUANIAN[] = "Lietuvių";

src/webui/www/private/views/preferences.html

@@ -689,7 +689,7 @@
             <option value="zh">简体中文</option>
             <option value="zh_TW">正體中文</option>
             <option value="zh_HK">香港正體字</option>
-            <option value="ko_KR">한글</option>
+            <option value="ko_KR">한국어</option>
         </select>
     </fieldset>