add loader for pseudo-nested entities

modules/fontane/index-processor.xqm

@@ -304,6 +304,15 @@ element xhtml:li {
                     if($targetNode[2])
                     then "two entities with same ID: " || $targetId
                     else string($targetNode/*[1])
+                },
+                element xhtml:span {
+                    attribute class { "load-entity" },
+                    attribute data-load { $targetId },
+                    text {" "},
+                    element xhtml:i {
+                        attribute class {"fa fa-plus-square-o"},
+                        attribute aria-hidden {"true"}
+                    }
                 }
             }
     }