Version 1.7.3

git-svn-id: https://plugins.svn.wordpress.org/blue-captcha/trunk@987657 b8457f37-d9ea-0310-8a92-e5e31aec5664
Version 1.7.3 (pt_BR language)

git-svn-id: https://plugins.svn.wordpress.org/blue-captcha/trunk@987658 b8457f37-d9ea-0310-8a92-e5e31aec5664