Corrected Edit actions depending on FormRequiredAttribute

- A change from input to button tag removed the value, and the attribute could not filter the POST anymore

--HG--
branch : dev

src/Orchard.Web/Core/Contents/Views/Items/Content.Edit.cshtml

@@ -5,7 +5,7 @@
     <div class="secondary">
         @Display(Model.Secondary)
         <fieldset>
-            <button class="primaryAction" type="submit" name="submit.Save">@T("Save")</button>
+            <button class="primaryAction" type="submit" name="submit.Save" value="submit.Save">@T("Save")</button>
         </fieldset>
     </div>
 </div>