fix(l10n): Update translations from Transifex

Signed-off-by: Nextcloud bot <bot@nextcloud.com>

Author: nextcloud-bot

app/src/main/res/values-ko/strings.xml

@@ -293,6 +293,7 @@
     <string name="files">파일</string>
     <string name="gallery">갤러리</string>
     <string name="videos">동영상</string>
+    <string name="simple_attach">첨부</string>
     <string name="add_stack_widget">목록 위젯 추가</string>
     <string name="add_filter_widget">필터 위젯 추가</string>
     <string name="simple_order">순서</string>