Update po file with newest handbook document.
Update translate 4. Installing Applications: Packages and Ports
Update translate 6.2. Browsers
Fix translate (Gateway, MTA).

Translated following chaptors or sectors:

11. Configuration and Tuning

11.13. Power and Resource Management

12. The FreeBSD Booting Process

12.1. Synopsis
12.2. FreeBSD Boot Process
12.3. Configuring Boot Time Splash Screens
12.4. Device Hints
12.5. Shutdown Sequence

13. Security

13.1. Synopsis
13.2. Introduction

17. Storage

17.8. Backup Basics

28. Network Servers

28.5. Lightweight Directory Access Protocol (LDAP)
28.6. Dynamic Host Configuration Protocol (DHCP)
A. Obtaining FreeBSD
A.2. FTP Sites
A.3. Using Subversion
A.4. Using rsync

Submitted by: cwlin0416@gmail.com
Differential Revision: https://reviews.freebsd.org/D9761