New: Preserve language tags when importing subtitle files

src/NzbDrone.Core/Extras/Subtitles/SubtitleFile.cs

@@ -1,3 +1,4 @@
+using System.Collections.Generic;
 using NzbDrone.Core.Extras.Files;
 using NzbDrone.Core.Languages;
 
@@ -5,6 +6,17 @@ namespace NzbDrone.Core.Extras.Subtitles
 {
     public class SubtitleFile : ExtraFile
     {
+        public SubtitleFile()
+        {
+            LanguageTags = new List<string>();
+        }
+
         public Language Language { get; set; }
+
+        public string AggregateString => Language + LanguageTagsAsString + Extension;
+
+        public List<string> LanguageTags { get; set; }
+
+        private string LanguageTagsAsString => string.Join(".", LanguageTags);
     }
 }