add Bosnian, Croatian, Serbian, Simplified Chinese and full Ukrainian translations kindly provided under GPLv3+

git-svn-id: https://plugins.svn.wordpress.org/cforms2/trunk@1024182 b8457f37-d9ea-0310-8a92-e5e31aec5664
version 14.7

git-svn-id: https://plugins.svn.wordpress.org/cforms2/trunk@1024210 b8457f37-d9ea-0310-8a92-e5e31aec5664