V3.7.4 - Added html-blocks and attributes in captcha displaying. The Czech language file is updated in the plugin. The Brazilian Portuguese language file is updated in the plugin. The Swedish language file is updated in the plugin.

git-svn-id: https://plugins.svn.wordpress.org/captcha/trunk@745555 b8457f37-d9ea-0310-8a92-e5e31aec5664