MDL-60717 lang: Merge English strings from the en_fix language pack

Significant string changes:

- needbcmath,auth_ldap - 'grace logins' changed to 'expired password
  checking'

auth/ldap/lang/en/auth_ldap.php

@@ -119,7 +119,7 @@
 $string['didntgetusersfromldap'] = "Did not get any users from LDAP -- error? -- exiting\n";
 $string['gotcountrecordsfromldap'] = "Got {\$a} records from LDAP\n";
 $string['morethanoneuser'] = 'Strange! More than one user record found in ldap. Only using the first one.';
-$string['needbcmath'] = 'You need the BCMath extension to use grace logins with Active Directory';
+$string['needbcmath'] = 'You need the BCMath extension to use expired password checking with Active Directory.';
 $string['needmbstring'] = 'You need the mbstring extension to change passwords in Active Directory';
 $string['nodnforusername'] = 'Error in user_update_password(). No DN for: {$a->username}';
 $string['noemail'] = 'Tried to send you an email but failed!';