fix label in generated form for relations
the label for object relations was incorrect, because the '_object' mangling is
done on the wrong component of field.label.
fix ticket 472831
#! /bin/sh -e#if [ "$1" = configure ]; then if which install-docs >/dev/null 2>&1; then install-docs -i /usr/share/doc-base/cubicweb-doc fifi#DEBHELPER#exit 0