$wgGrantPermissions['editinterface'] = $wgGrantPermissions['editpage'];
$wgGrantPermissions['editinterface']['editinterface'] = true;
$wgGrantPermissions['editinterface']['editusercss'] = true;
$wgGrantPermissions['editinterface'] = $wgGrantPermissions['editpage'];
$wgGrantPermissions['editinterface']['editinterface'] = true;
$wgGrantPermissions['editinterface']['editusercss'] = true;