Fix en lang key

lang/en.inc.php

@@ -78,7 +78,7 @@
 $messages['label_pwdaccountlockedtime'] = "Locking date";
 $messages['label_pwdchangedtime'] = "Last password change";
 $messages['label_pwdfailuretime'] = "Last authentication failures";
-$messages['label_pwdgraceauthtime'] = "Last grace authentications";
+$messages['label_pwdgraceusetime'] = "Last grace authentications";
 $messages['label_pwdpolicysubentry'] = "Associated password policy";
 $messages['label_pwdreset'] = "Reset password at next connection";
 $messages['label_result'] = "Result";