update hls subtitles

MediaBrowser.Model/Dlna/TranscodingProfile.cs

@@ -38,6 +38,9 @@ namespace MediaBrowser.Model.Dlna
         [XmlAttribute("forceLiveStream")]
         public bool ForceLiveStream { get; set; }
 
+        [XmlAttribute("enableSubtitlesInManifest")]
+        public bool EnableSubtitlesInManifest { get; set; }
+
         [XmlAttribute("maxAudioChannels")]
         public string MaxAudioChannels { get; set; }