Made it so all of the admin text can be localized 

git-svn-id: https://plugins.svn.wordpress.org/rsvp/trunk@1045554 b8457f37-d9ea-0310-8a92-e5e31aec5664
New pot and german version

git-svn-id: https://plugins.svn.wordpress.org/rsvp/trunk@1045560 b8457f37-d9ea-0310-8a92-e5e31aec5664