Add ko translation

Author: onesounds

Flow.Launcher/Languages/ko.xaml

@@ -152,6 +152,7 @@
     <system:String x:Key="devtool">개발자도구</system:String>
     <system:String x:Key="settingfolder">설정 폴더</system:String>
     <system:String x:Key="logfolder">로그 폴더</system:String>
+    <system:String x:Key="welcomewindow">마법사</system:String>
 
     <!--  FileManager Setting Dialog  -->
     <system:String x:Key="fileManagerWindow">파일관리자 선택</system:String>