readonly input for system groups

templates/groups/details.tpl

@@ -157,7 +157,7 @@
 				<form component="groups/settings" role="form">
 					<div class="form-group">
 						<label for="name">[[groups:details.group_name]]</label>
-						<input class="form-control" name="name" id="name" type="text" value="{group.displayName}" />
+						<input <!-- IF group.system -->readonly<!-- ENDIF group.system --> class="form-control" name="name" id="name" type="text" value="{group.displayName}" />
 					</div>
 					<div class="form-group">
 						<label for="name">[[groups:details.description]]</label>