the old "www/layout/<admin/frontend>/<template name>/..." layout is
deprecated.
new layout:
www/layout/<admin|frontend>/<cache/css/images/javascript>/
The layout/<admin/frontend> is symlinked to www/<admin|frontend>/layout
templates and lang are moved to includes
www/includes/template/<admin/frontend>
www/includes/lang/<admin/frontend>
and no longer symlinked to any public facing folders
The language po files have already been moved to
4dev/lang/<admin|frontend>/
593e8fa7b0