https://mathcitymap.eu/el/%cf%80%cf%8d%ce%bb%ce%b7/#!/ When changing the portal language to greek, it will display the following message above the primary toolbar: Warning : sprintf(): Too few arguments in /homepages/26/d621514490/htdocs/mathcitymap/wp-content/plugins/wp-members/inc/dialogs.php on line 339

This also happens on the chinese version