Update settings.php

lib/plugins/authad/lang/en/settings.php

@@ -3,12 +3,12 @@
 $lang['account_suffix']     = 'Your account suffix. Eg. <code>@my.domain.org</code>';
 $lang['base_dn']            = 'Your base DN. Eg. <code>DC=my,DC=domain,DC=org</code>';
 $lang['domain_controllers'] = 'A comma separated list of Domain controllers. Eg. <code>srv1.domain.org,srv2.domain.org</code>';
-$lang['ad_username']        = 'A privileged Active Directory user with access to all other user\'s data. Optional, but needed for certain actions like sending subscription mails.';
-$lang['ad_password']        = 'The password of the above user.';
+$lang['admin_username']        = 'A privileged Active Directory user with access to all other user\'s data. Optional, but needed for certain actions like sending subscription mails.';
+$lang['admin_password']        = 'The password of the above user.';
 $lang['sso']                = 'Should Single-Sign-On via Kerberos or NTLM be used?';
 $lang['real_primarygroup']  = 'Should the real primary group be resolved instead of assuming "Domain Users" (slower)';
 $lang['use_ssl']            = 'Use SSL connection? If used, do not enable TLS below.';
 $lang['use_tls']            = 'Use TLS connection? If used, do not enable SSL above.';
 $lang['debug']              = 'Display additional debugging output on errors?';
 $lang['expirywarn']         = 'Days in advance to warn user about expiring password. 0 to disable.';
-$lang['additional']         = 'A comma separated list of additional AD attributes to fetch from user data. Used by some plugins.';
\ No newline at end of file
+$lang['additional']         = 'A comma separated list of additional AD attributes to fetch from user data. Used by some plugins.';