Portscout is now portscout.freebsd.org. The old domain portscout.org now contains dubious content. The links should be removed from the translated documentation.
A commit references this bug: Author: bcr Date: Sun Dec 23 12:38:28 UTC 2018 New revision: 52710 URL: https://svnweb.freebsd.org/changeset/doc/52710 Log: Change the two remaining links of www.portscout.org in the zh_CN and de_DE versions of the porters handbook to the newer portscout.freebsd.org. I rewrapped only the de_DE version. PR: 232295 Submitted by: arved@ Changes: head/de_DE.ISO8859-1/books/porters-handbook/book.xml head/zh_CN.UTF-8/books/porters-handbook/book.xml
Patch committed to both translations. Thanks for filing the PR!