Updated temp text in NotFound page

--HG--
branch : dev

src/Orchard.Web/Core/Themes/Views/NotFound.ascx

@@ -1,4 +1,4 @@
 <%@ Control Language="C#" Inherits="Orchard.Mvc.ViewUserControl<object>" %>
 <%@ Import Namespace="Orchard.Mvc.ViewModels"%>
 <h1><%=Html.TitleForPage(T("Not found").ToString()) %></h1>
-<p>TODO: (erikpo) Add friendly message here</p>
+<p><%=_Encoded("The page you are looking for does not exist.")%></p>