add tagline to editing interface

MediaBrowser.Api/ApiEntryPoint.cs

@@ -418,7 +418,7 @@ namespace MediaBrowser.Api
 
         private async void DeletePartialStreamFiles(string path, TranscodingJobType jobType, int retryCount, int delayMs)
         {
-            if (retryCount >= 8)
+            if (retryCount >= 10)
             {
                 return;
             }

MediaBrowser.Api/ItemUpdateService.cs

@@ -108,6 +108,12 @@ namespace MediaBrowser.Api
                 hasTags.Tags = request.Tags;
             }
 
+            var hasTaglines = item as IHasTaglines;
+            if (hasTaglines != null)
+            {
+                hasTaglines.Taglines = request.Taglines;
+            }
+
             var hasShortOverview = item as IHasShortOverview;
             if (hasShortOverview != null)
             {