New: Parse existing subtitles and extra files

Towards #459

src/NzbDrone.Core/Parser/IsoLanguage.cs

@@ -0,0 +1,16 @@
+namespace NzbDrone.Core.Parser
+{
+    public class IsoLanguage
+    {
+        public string TwoLetterCode { get; set; }
+        public string ThreeLetterCode { get; set; }
+        public Language Language { get; set; }
+
+        public IsoLanguage(string twoLetterCode, string threeLetterCode, Language language)
+        {
+            TwoLetterCode = twoLetterCode;
+            ThreeLetterCode = threeLetterCode;
+            Language = language;
+        }
+    }
+}