[trunk_admin] Update nl_NL, thanks to : Kees Hessels

git-svn-id: http://piwigo.org/svn/trunk@23812 68402e56-0260-453c-a942-63ccdbb3a9ee
bug 2931: revert r23675 & r23721, make element_set_ranks.php uses ASC keyword (+ migration task)

git-svn-id: http://piwigo.org/svn/trunk@23813 68402e56-0260-453c-a942-63ccdbb3a9ee