[$USER_AGENT$] placeholder is misleading

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.1.30 EE GA3, 6.1.X EE, 6.2.X EE, 7.0.0 M3
• Fix Version/s: 6.1.X EE, 6.2.2 CE GA3 , 6.2.X EE, 7.0.0 M1
• Component/s: Legacy Components, Legacy Components > Administration UI
• Labels:
  • ee-ts
  • liferay-fixpack-administration-8-6130
  • liferay-fixpack-administration-8-6210
  • liferay-fixpack-platform-26-6210
  • liferay-fixpack-platform-28-6130
• Branch Version/s:
  6.2.x, 6.1.x
• Backported to Branch:
  Committed
• Story Points: 8
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/20118

The fix for LPS-22979 removed the [$USER_AGENT$] placeholder replacement because of security reasons.
However, the UI still indicates that it will be replaced in the notification emails. See the attached image (USER_AGENT.png).

Reproduction steps:
1) Set the mail.session.mail settings in portal-ext and start the portal
2) Go to Portal Settings -> Email Notifications and put the [$USER_AGENT$] to each Notifications' body. Some of the notification templates already contains it.
3) Make the portal to send the Notifications
Result: the [$USER_AGENT$] string appears

Actually this is the correct behavior, but the UI is misleading, so the fix should remove the [$USER_AGENT$] placeholder completely.