MFH: r435603

chinese/wordpress-zh_CN, chinese/wordpress-zh_TW, german/wordpress,
japanese/wordpress and www/wordpress, : Update from 4.7.2 to 4.7.3

Changelog: https://wordpress.org/news/2017/03/wordpress-4-7-3-security-and-maintenance-release/

This update fixes 6 security issues.

PR: 217608
Submitted by: Jochen Neumeister (maintainer)

Approved by: ports-secteam (junovitch)