support keyword editing

MediaBrowser.Model/Entities/MetadataFields.cs

@@ -15,6 +15,10 @@ namespace MediaBrowser.Model.Entities
         /// </summary>
         Genres,
         /// <summary>
+        /// The keywords
+        /// </summary>
+        Keywords,
+        /// <summary>
         /// The production locations
         /// </summary>
         ProductionLocations,

MediaBrowser.Providers/Movies/MovieDbProvider.cs

@@ -847,7 +847,7 @@ namespace MediaBrowser.Providers.Movies
                 }
             }
 
-            if (movieData.keywords != null && movieData.keywords.keywords != null && !movie.LockedFields.Contains(MetadataFields.Tags))
+            if (movieData.keywords != null && movieData.keywords.keywords != null && !movie.LockedFields.Contains(MetadataFields.Keywords))
             {
                 var hasTags = movie as IHasKeywords;
                 if (hasTags != null)