removed redundant tags

git-svn-id: https://plugins.svn.wordpress.org/landing-pages-builder/trunk@1016291 b8457f37-d9ea-0310-8a92-e5e31aec5664
added back the 'plugin, plugins' tags; wordpress seems to use them quite frequently

git-svn-id: https://plugins.svn.wordpress.org/landing-pages-builder/trunk@1016296 b8457f37-d9ea-0310-8a92-e5e31aec5664