add movie, show, artist language buttons. search by english language name (#162)

ErsatzTV.Application/Movies/Mapper.cs

@@ -1,5 +1,9 @@
-using System.Linq;
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
 using ErsatzTV.Core.Domain;
+using LanguageExt;
 using static LanguageExt.Prelude;
 
 namespace ErsatzTV.Application.Movies
@@ -17,7 +21,24 @@ namespace ErsatzTV.Application.Movies
                 Artwork(metadata, ArtworkKind.FanArt),
                 metadata.Genres.Map(g => g.Name).ToList(),
                 metadata.Tags.Map(t => t.Name).ToList(),
-                metadata.Studios.Map(s => s.Name).ToList());
+                metadata.Studios.Map(s => s.Name).ToList(),
+                LanguagesForMovie(movie));
+        }
+
+        private static List<CultureInfo> LanguagesForMovie(Movie movie)
+        {
+            CultureInfo[] allCultures = CultureInfo.GetCultures(CultureTypes.NeutralCultures);
+
+            return movie.MediaVersions
+                .Map(mv => mv.Streams.Filter(s => s.MediaStreamKind == MediaStreamKind.Audio).Map(s => s.Language))
+                .Flatten()
+                .Distinct()
+                .Map(
+                    lang => allCultures.Filter(
+                        ci => string.Equals(ci.ThreeLetterISOLanguageName, lang, StringComparison.OrdinalIgnoreCase)))
+                .Sequence()
+                .Flatten()
+                .ToList();
         }
 
         private static string Artwork(Metadata metadata, ArtworkKind artworkKind) =>