Display the message after settings updating is completed.

src/main/twirl/admin/system.scala.html

@@ -1,8 +1,14 @@
-@(settings: service.SystemSettingsService.SystemSettings)(implicit context: app.Context)
+@(settings: service.SystemSettingsService.SystemSettings, info: Option[Any])(implicit context: app.Context)
 @import context._
 @import view.helpers._
 @html.main("System Settings"){
   @menu("system"){
+    @if(info.isDefined){
+      <div class="alert alert-info">
+        <button type="button" class="close" data-dismiss="alert">×</button>
+        @info
+      </div>
+    }
     <form action="@path/admin/system" method="POST" validate="true">
       <div class="box">
         <div class="box-header">System Settings</div>