Update the way sh:targetClass of box.getLabel() is rendered.#168

cecemel wants to merge 1 commit intosparna-git:mastersparna-git/shacl-play:masterfrom

cecemel:fix/use_the_sh_targetClass_if_present_otherwise_use_the_URI_of_the_NodeShapececemel/shacl-play:fix/use_the_sh_targetClass_if_present_otherwise_use_the_URI_of_the_NodeShapeCopy head branch name to clipboard