Added the Serbo-Croatian language.

git-svn-id: https://plugins.svn.wordpress.org/responsive-column-widgets/trunk@858230 b8457f37-d9ea-0310-8a92-e5e31aec5664
* Added: the option to delay sidebar registration.

git-svn-id: https://plugins.svn.wordpress.org/responsive-column-widgets/trunk@858231 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated the tested-up-to version.

git-svn-id: https://plugins.svn.wordpress.org/responsive-column-widgets/trunk@858234 b8457f37-d9ea-0310-8a92-e5e31aec5664