add subtitle language detection

Emby.Common.Implementations/TextEncoding/NLangDetect/NLangDetectException.cs

@@ -0,0 +1,23 @@
+using System;
+
+namespace NLangDetect.Core
+{
+  public class NLangDetectException : Exception
+  {
+    #region Constructor(s)
+
+    public NLangDetectException(string message, ErrorCode errorCode)
+      : base(message)
+    {
+      ErrorCode = errorCode;
+    }
+
+    #endregion
+
+    #region Properties
+
+    public ErrorCode ErrorCode { get; private set; }
+
+    #endregion
+  }
+}