CEN-324, placeholder back-end

code/editableformfields/PlaceHolderField.php

+<?php
+
+class PlaceHolderField extends EditableFormField {
+    
+    private static $singular_name = 'Placeholder';
+
+    private static $plural_name = 'Placeholder';
+    
+    private static $literal = true;
+    
+    public function getFormField() {
+        $labelField = new HeaderField($this->Name, $this->EscapedTitle, $this->Level);
+        $labelField->setAttribute('data-show-on-load', true);
+        return $labelField;
+    }
+}
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