The Italian docbook stylesheet is wrong. I already contacted Norman Walsh, and my changes will be included in the next release. In the meanwhile, this is the patch for the downgraded 1.73 version (This PR supersedes PR 40651). This patch is mandatory for building correct Italian docs.
Responsible Changed From-To: freebsd-ports->kuriyama over to maintainer
State Changed From-To: open->closed Committed, thanks!