PHRAS-4068 expose mapping label (#4514) #942

Job	Run time
build phraseanet-db / build	19s
build phraseanet-nginx / build	37s
build phraseanet-elasticsearch / build	27s
build phraseanet-fpm / build	28s
build phraseanet-setup / build	28s
build phraseanet-worker / build	30s
unit test	5m 55s
	8m 44s

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