Remove the 'ports.size' target and all references to it in
the htdocs/ directories.

While here, fix the hostname(1) evaluation for non-en_US
translations.

These scripts used to fetch the ports.tgz file from FTP, but
this file no longer exists. Since we already reference the
size of the ports tree (via share/xml/freebsd.ent) for the
Handbook, I do not plan to bring back this functionality, as
the information it was producing was incorrect anyway.

Note to translators of de_DE, ja_JP, and ru_RU trees:
The relevant files in the htdocs/ directories also needed to
be updated as part of this commit to avoid breaking the build.

Because my editor does not seem to properly handle ja_JP or
ru_RU, editing the installing.xml files within those trees was
not an option, as it mangled the file after saving. A sed(1)
substitution to comment the '&ports.size;' macro was done here
instead, but the entire line referencing ftp.freebsd.org should
be removed instead.

Approved by: doceng (implicit)
Sponsored by: The FreeBSD Foundation