Updated list of supported languages.

git-svn-id: https://plugins.svn.wordpress.org/appointment-booking-calendar/trunk@1018286 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fixed typo introduced in the previous update.

git-svn-id: https://plugins.svn.wordpress.org/appointment-booking-calendar/trunk@1018287 b8457f37-d9ea-0310-8a92-e5e31aec5664