sync Lithuanian jQuery datepicker (#13674)

This is from following revision.
https://github.com/marutosi/jquery-ui/commit/49f9b849b9c5023f138e8932510b11bfc9765814

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11802 e93f8b46-1217-0410-a6f0-8f06a7374b81