Remove links to translated versions of the website for unmaintained translations

The only website translations that have been updated in the last 2 years are
German and Japanese. Some of the download pages in these translations offer
FreeBSD 2.2.8 and 3.4, builds for Alpha, or 11.0-RELEASe for pc98 because
the pages have not been updated.

Reported by: matteo@openwrt.org via the FOSDEM FreeBSD Booth
Reviewed by: bcr