ntp: adjust string accordingly; closes #1574

(cherry picked from commit baa7ec88)

src/www/services_ntpd.php

@@ -280,9 +280,9 @@ include("head.inc");
                       <div class="hidden" for="help_for_timeservers">
                         <?=gettext('For best results three to five servers should be configured here.'); ?>
                         <br />
-                        <?= sprintf(gettext('The %sprefer%s option indicates that NTP should favor the use of this server more than all others.'),'<i>','</i>') ?>
+                        <?= gettext('The "prefer" option indicates that NTP should favor the use of this server more than all others.') ?>
                         <br />
-                        <?= sprintf(gettext('The %snoselect%s option indicates that NTP should not use this server for time, but stats for this server will be collected and displayed.'),'<i>','</i>') ?>
+                        <?= gettext('The "do not use" option indicates that NTP should not use this server for time, but stats for this server will be collected and displayed.') ?>
                       </div>
                     </td>
                   </tr>