• Update po file with newest handbook document.
• Translated following chaptors or sectors: 28.7. Domain Name System (DNS) 28.8. Apache HTTP Server 28.9. File Transfer Protocol (FTP) 28.10. File and Print Services for Microsoft® Windows® Clients (Samba) 28.11. Clock Synchronization with NTP 29.1. Synopsis 29.2. Firewall Concepts

Submitted by: cwlin@gmail.com
Differential Revision: https://reviews.freebsd.org/D12756