Fix some menu tree header won't be translated.

This may be caused by the explicit definition of tree node name.

Signed-off-by: wanddy <wanddy@163.com>

src/Umbraco.Web/Trees/TemplatesTreeController.cs

@@ -21,7 +21,7 @@ namespace Umbraco.Web.Trees
 {
     [UmbracoTreeAuthorize(Constants.Trees.Templates)]
     [LegacyBaseTree(typeof (loadTemplates))]
-    [Tree(Constants.Applications.Settings, Constants.Trees.Templates, "Templates", sortOrder:1)]
+    [Tree(Constants.Applications.Settings, Constants.Trees.Templates, null, sortOrder:1)]
     [PluginController("UmbracoTrees")]
     [CoreTree]
     public class TemplatesTreeController : TreeController