• Translated 5.3.1. Subdirectory Makefiles.
• Fix typo and words spacing.
• Remove unused translations from PO.
• Add "svn propset fbsd:nokeywords yes zh_TW.po" to avoid $FreeBSD$ strings expand to version strings.

Submitted by: cwlin0416@gmail.com
Differential Revision: https://reviews.freebsd.org/D10142