This is the ".form/skos:prefLabel" template. It should be called in the following format:

{{.form/skos:prefLabel
|hostForm=full pagename of host form
|skosName =eg prefLabel
|propName =eg skos:prefLabel 
|propLabel=eg Preferred name
|placeholder=
|textintro=
|textoutro=
}}

Edit the page to see the template text.