l10n: Korean update

Signed-off-by: Christoph Miebach <christoph.miebach@web.de>

vlc-android/res/values-ko/strings.xml

@@ -272,6 +272,7 @@
     <string name="file_other">탐색메뉴 닫기</string>
     <string name="audio_delay">음성 지연</string>
     <string name="spu_delay">자막 지연</string>
+    <string name="sleep_time_not_set">아무 설정 않음</string>
     <string name="network_shares_discovery">네트워크 공유 검색 중...</string>
     <string name="network_empty">폴더가 비었습니다.</string>
     <string name="network_connection_needed">로컬 네트워크에 접속 없음.</string>