Don't allow to set episode files with 'Original' language

src/Sonarr.Api.V3/EpisodeFiles/EpisodeFileController.cs

@@ -1,10 +1,13 @@
+using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Net;
 using Microsoft.AspNetCore.Mvc;
 using NzbDrone.Core.CustomFormats;
 using NzbDrone.Core.Datastore.Events;
 using NzbDrone.Core.DecisionEngine.Specifications;
 using NzbDrone.Core.Exceptions;
+using NzbDrone.Core.Languages;
 using NzbDrone.Core.MediaFiles;
 using NzbDrone.Core.MediaFiles.Events;
 using NzbDrone.Core.Messaging.Events;
@@ -153,7 +156,7 @@ namespace Sonarr.Api.V3.EpisodeFiles
 
             if (episodeFile == null)
             {
-                throw new NzbDroneClientException(global::System.Net.HttpStatusCode.NotFound, "Episode file not found");
+                throw new NzbDroneClientException(HttpStatusCode.NotFound, "Episode file not found");
             }
 
             var series = _seriesService.GetSeries(episodeFile.SeriesId);
@@ -188,7 +191,8 @@ namespace Sonarr.Api.V3.EpisodeFiles
 
                 if (resourceEpisodeFile.Languages != null)
                 {
-                    episodeFile.Languages = resourceEpisodeFile.Languages;
+                    // Don't allow user to set files with 'Original' language
+                    episodeFile.Languages = resourceEpisodeFile.Languages.Where(l => l != null && l != Language.Original).ToList();
                 }
 
                 if (resourceEpisodeFile.Quality != null)
@@ -218,7 +222,9 @@ namespace Sonarr.Api.V3.EpisodeFiles
             }
 
             _mediaFileService.Update(episodeFiles);
+
             var series = _seriesService.GetSeries(episodeFiles.First().SeriesId);
+
             return Accepted(episodeFiles.ConvertAll(f => f.ToResource(series, _upgradableSpecification, _formatCalculator)));
         }