djangocms.py

def setup(app):                                                                
    app.add_crossref_type(                                                     
        directivename = "setting",                                             
        rolename      = "setting",                                             
        indextemplate = "pair: %s; setting",                                   
    )
    app.add_crossref_type(
        directivename = "templatetag",
        rolename      = "ttag",
        indextemplate = "pair: %s; template tag"
    )