fix some typo & update message hook

git-svn-id: https://plugins.svn.wordpress.org/social-semantic-recommendation-sosere/trunk@857859 b8457f37-d9ea-0310-8a92-e5e31aec5664
fix update activation hook

git-svn-id: https://plugins.svn.wordpress.org/social-semantic-recommendation-sosere/trunk@857865 b8457f37-d9ea-0310-8a92-e5e31aec5664