Fix Logger and Localizer properties to be public

If they are not public, they are not injected (no private
reflection in Medium Trust)

--HG--
branch : 1.x

src/Orchard.Web/Core/Settings/Descriptor/ShellDescriptorManager.cs

@@ -19,7 +19,7 @@ namespace Orchard.Core.Settings.Descriptor {
             T = NullLocalizer.Instance;
         }
 
-        Localizer T { get; set; }
+        public Localizer T { get; set; }
 
         public ShellDescriptor GetShellDescriptor() {
             ShellDescriptorRecord shellDescriptorRecord = GetDescriptorRecord();