Make the JS calendar translatable

git-svn-id: http://yourls.googlecode.com/svn@903 12232710-3e20-11de-b438-597f59cd7555
Oops, missing translatable strings in the calendar.

git-svn-id: http://yourls.googlecode.com/svn@904 12232710-3e20-11de-b438-597f59cd7555