Bring back Import from DMSGuestbook and small misc fixes

git-svn-id: https://plugins.svn.wordpress.org/gwolle-gb/trunk@1045710 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update pot file

git-svn-id: https://plugins.svn.wordpress.org/gwolle-gb/trunk@1045713 b8457f37-d9ea-0310-8a92-e5e31aec5664