Image language fix

The language only needs to be added if it is not already part of the
list. It is not necessarily a problem, it just winds up with duplicates.

MediaBrowser.Providers/BoxSets/MovieDbBoxSetProvider.cs

@@ -172,7 +172,7 @@ namespace MediaBrowser.Providers.BoxSets
             if (!string.IsNullOrEmpty(language))
             {
                 // If preferred language isn't english, get those images too
-                if (imageLanguages.Contains(language, StringComparer.OrdinalIgnoreCase))
+                if (!imageLanguages.Contains(language, StringComparer.OrdinalIgnoreCase))
                 {
                     imageLanguages.Add(language);
                 }

MediaBrowser.Providers/Movies/MovieDbProvider.cs

@@ -295,7 +295,7 @@ namespace MediaBrowser.Providers.Movies
             if (!string.IsNullOrEmpty(language))
             {
                 // If preferred language isn't english, get those images too
-                if (imageLanguages.Contains(language, StringComparer.OrdinalIgnoreCase))
+                if (!imageLanguages.Contains(language, StringComparer.OrdinalIgnoreCase))
                 {
                     imageLanguages.Add(language);
                 }