IcingaUserForm: add display_name

fixes #11395

application/forms/IcingaUserForm.php

@@ -39,6 +39,7 @@ class IcingaUserForm extends DirectorObjectForm
 
         $this->addGroupsElement()
              ->addImportsElement()
+             ->addDisplayNameElement()
              ->addEnableNotificationsElement()
              ->addDisabledElement()
              ->addEventFilterElements()
@@ -79,6 +80,23 @@ class IcingaUserForm extends DirectorObjectForm
         return $this;
     }
 
+    protected function addDisplayNameElement()
+    {
+        if ($this->isTemplate()) {
+            return $this;
+        }
+
+        $this->addElement('text', 'display_name', array(
+            'label' => $this->translate('Display name'),
+            'description' => $this->translate(
+                'Alternative name for this user. In case your object name is a'
+                . ' username, this could be the full name of the corresponding person'
+            )
+        ));
+
+        return $this;
+    }
+
     protected function groupObjectDefinition()
     {
         $elements = array(