I suppose if language is set, that happens in the wrapping ReqIF
document, not in the XHTML fragments.

Change-Id: I970c3810b7f02bbafc37dd85e095b254cc651330
Reviewed-on: https://gerrit.libreoffice.org/59810
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>