update bulgarian decoding

Emby.Common.Implementations/TextEncoding/TextEncoding.cs

@@ -157,6 +157,7 @@ namespace Emby.Common.Implementations.TextEncoding
                 case "ota":
                 case "tur":
                     return "windows-1254";
+                case "bgr":
                 case "rus":
                     return "windows-1251";
                 case "vie":