sync Lithuanian jQuery datepicker (#13674)

This is from following revision.
https://github.com/jquery/jquery-ui/commit/ce73a2688de47c975727ad9555cae84eb6997486

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11825 e93f8b46-1217-0410-a6f0-8f06a7374b81