core: remove html language tag for pages that are translated #22683

Job	Run time
test-unittest	3m 43s
lint-golint	50s
ci-outpost-mark	1s
build-binary (proxy, linux, amd64)	2m 25s
build-container (proxy)	2m 54s
build-binary (proxy, linux, arm64)	3m 56s
build-container (ldap)	2m 33s
build-binary (ldap, linux, amd64)	3m 37s
build-container (radius)	2m 45s
build-binary (ldap, linux, arm64)	2m 5s
build-container (rac)	2m 28s
build-binary (radius, linux, amd64)	1m 56s
build-binary (radius, linux, arm64)	2m 35s
build-binary (rac, linux, amd64)	2m 33s
build-binary (rac, linux, arm64)	3m 30s
	37m 51s

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