MDL-9399 auth/ldap: NTLM SSO - fix hardcoded strings

From Iñaki Arenaza
And here is a little patch with the last remaining non-traslated
strings (unless I missed something).

auth/ldap/ntlmsso_attempt.php

@@ -23,7 +23,7 @@ if (empty($authplugin->config->ntlmsso_enabled)) {
 $sesskey = sesskey();
 
 //print_header("$site->fullname: $loginsite", $site->fullname, $loginsite, $focus, '', true);
-$msg = '<p>Attempting SSO...</p>'
+$msg = '<p>'.get_string('ntlmsso_attempting','auth').'</p>'
     . '<img width="1", height="1" '
     . ' src="' . $CFG->wwwroot . '/auth/ldap/ntlmsso_magic.php?sesskey='
     . $sesskey . '" />';

auth/ldap/ntlmsso_finish.php

@@ -25,6 +25,6 @@ if (empty($authplugin->config->ntlmsso_enabled)) {
 if (!$authplugin->ntlmsso_finish()) {
     // Redirect to login, saying "don't try again!"
     redirect($CFG->wwwroot . '/login/index.php?authldap_skipntlmsso=1', 
-             "Single Sign On failed, proceed to normal login", 3);
+             get_string('ntlmsso_failed','auth'), 3);
 }
 ?>