Ensures that the Name field shows validation correctly with server side validation - needs Mads to verify this is ok.

src/Umbraco.Web.UI.Client/src/views/components/editor/umb-editor-header.html

@@ -26,7 +26,10 @@
                         ng-model="name"
                         ng-class="{'name-is-empty': $parent.name===null || $parent.name===''}"
                         umb-auto-focus
+                        val-server-field="Name"
                         required />
+                       <div class="umb-validation-label" val-msg-for="headerName" val-toggle-msg="required"><localize key="general_required">Required</localize> <localize key="general_name">name</localize></div>
+                       <div class="umb-validation-label" val-msg-for="headerName" val-toggle-msg="valServerField"></div>
                    </ng-form>
 
                   <div class="umb-panel-header-name" ng-if="nameLocked">{{ name }}</div>