Fix language changes on ipv6 and conn subdomains #1614

Job	Run time
build-docker (internet.nl, docker/Dockerfile, app)	2m 23s
build-docker (unbound, docker/Dockerfile, unbound)	1m 8s
build-docker (linttest, docker/Dockerfile, linttest)	4m 12s
build-docker (test-runner, docker/test-runner.Dockerfile)	4m 5s
build-docker (webserver, docker/webserver.Dockerfile)	1m 39s
build-docker (grafana, docker/grafana.Dockerfile)	1m 29s
build-docker (util, docker/util.Dockerfile)	1m 11s
lint/check	2m 38s
integration-test	4m 52s
development-environment-test	4m 19s
batch-integration-test	4m 10s
docs	1s
test	4m 16s
	36m 23s

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