add KGTK_LABEL_FILE
"description_zhcn": "descriptions.zh-cn.tsv.gz",
"label_de": "labels.de.tsv.gz",
"label": "labels.en.tsv.gz",
+ "KGTK_LABEL_FILE": "labels.en.tsv.gz",
"label_es": "labels.es.tsv.gz",
"label_fr": "labels.fr.tsv.gz",
"label_it": "labels.it.tsv.gz",
