related to #1679 Changed "piwigo configuration" to "configuration"

admin/configuration.php

@@ -608,6 +608,7 @@ switch ($page['section'])
 }
 
 $template->assign('isWebmaster', (is_webmaster()) ? 1 : 0);
+$template->assign('ADMIN_PAGE_TITLE', l10n('Configuration'));
 
 //----------------------------------------------------------- sending html code
 $template->assign_var_from_handle('ADMIN_CONTENT', 'config');