Merge pull request #18666 from civicrm/5.30

5.30 to master

settings/Mailing.setting.php

@@ -386,6 +386,6 @@
     'is_domain' => 1,
     'is_contact' => 0,
     'description' => ts('The frequency that CiviMail updates its sent mail database.'),
-    'help_text' => 'CiviMail records email sent at the frequency you specify.  If you set it to 1, it will update the database every time it sends an email.  This ensures that emails are not resent if the batch job fails, but this may cause a performance hit, particularly for large jobs.',
+    'help_text' => NULL,
   ],
 ];

templates/CRM/Admin/Form/Setting/Mail.hlp

@@ -0,0 +1,14 @@
+{*
+ +--------------------------------------------------------------------+
+ | Copyright CiviCRM LLC. All rights reserved.                        |
+ |                                                                    |
+ | This work is published under the GNU AGPLv3 license with some      |
+ | permitted exceptions and without any warranty. For full license    |
+ | and copyright information, see https://civicrm.org/licensing       |
+ +--------------------------------------------------------------------+
+*}
+{htxt id="civimail-sync-interval-id"}
+  <p>
+    {ts}CiviMail records email sent at the frequency you specify. If you set it to 1, it will update the database every time it sends an email. This ensures that emails are not resent if the batch job fails, but this may cause a performance hit, particularly for large jobs.{/ts}
+  </p>
+{/htxt}