IcingaCommandArgument: $hostname$ -> $host.name$

https://docs.icinga.com/icinga2/latest/doc/module/icinga2/chapter/monitoring-basics#host-runtime-macros
(3.4.2. Host Runtime Macros)
$hostname$ doesn't work

application/forms/IcingaCommandArgumentForm.php

@@ -53,7 +53,7 @@ class IcingaCommandArgumentForm extends DirectorObjectForm
             $this->addElement('text', 'argument_value', array(
                 'label'       => $this->translate('Value'),
                 'description' => $this->translate(
-                    'e.g. 5%, $hostname$, $lower$%:$upper$%'
+                    'e.g. 5%, $host.name$, $lower$%:$upper$%'
                 )
             ));
         }