Updated translations with new string values

git-svn-id: https://plugins.svn.wordpress.org/redi-restaurant-reservation/trunk@785490 b8457f37-d9ea-0310-8a92-e5e31aec5664
Don't send additional fields if they are empty

git-svn-id: https://plugins.svn.wordpress.org/redi-restaurant-reservation/trunk@786979 b8457f37-d9ea-0310-8a92-e5e31aec5664
Tabs added + iframe

git-svn-id: https://plugins.svn.wordpress.org/redi-restaurant-reservation/trunk@787399 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added tabs for Free and Basic package settings

git-svn-id: https://plugins.svn.wordpress.org/redi-restaurant-reservation/trunk@790944 b8457f37-d9ea-0310-8a92-e5e31aec5664