[trunk_public] Update zh_CN, thanks to : winson

git-svn-id: http://piwigo.org/svn/trunk@23585 68402e56-0260-453c-a942-63ccdbb3a9ee
fix define_derivative (matter of smarty3 variable scope)

git-svn-id: http://piwigo.org/svn/trunk@23588 68402e56-0260-453c-a942-63ccdbb3a9ee
[elegant] Add lt_LT, thanks to : vilisas

git-svn-id: http://piwigo.org/svn/trunk@23597 68402e56-0260-453c-a942-63ccdbb3a9ee
fix missing prev/next nav items in the calendar view (Smarty get_template_vars by reference not working anymore)

git-svn-id: http://piwigo.org/svn/trunk@23618 68402e56-0260-453c-a942-63ccdbb3a9ee