Issue #3428454: Email subject with <em> html tag

[vcsvinicius]

Problem

When processing activities such as creating a post in the stream it will send out emails. When there is no subject pre-defined it will will use the default Notification from %site_name, but the % placeholder when processed will surround the text with the HTML <em class="placeholder">. Since email subject html rendering can be different per email provider it can happen that this will show the HTML as raw.

Solution

Change the placeholder % to @ as this is similar to % but without the rendering of the HTML tag.

Issue tracker

PROD-28384
#3428454

Theme issue tracker

N/A

How to test

• Create two diferent users with email
• Access with user 1 and create a post
• Access with user 2 and comment post created by user 1
• Run cron
• Check the email

Definition of done

Before merge

• Code/peer review is completed
• All commit messages are clear and clean. If applicable a rebase was performed
• All automated tests are green
• Functional/manual tests of the acceptance criteria are approved
• All acceptance criteria were met
• New features or changes to existing features are covered by tests, either unit (preferably) or behat
• Update path is tested. New hook_updates should respect update order, right naming convention and consider hook_post_update code
• Module can be safely uninstalled. Update/implement hook_uninstall and make sure that removed configuration or dependencies are removed/uninstalled
• This pull request has all required labels (team/type/priority)
• This pull request has a milestone
• This pull request has an assignee (if applicable)
• Any front end changes are tested on all major browsers
• New UI elements, or changes on UI elements are approved by the design team
• New features, or feature changes are approved by the product owner

After merge

• Code is tested on all branches that it has been cherry-picked
• Update hook number might need adjustment, make sure they have the correct order
• The Drupal.org ticket(s) are updated according to this pull request status

Screenshots

N/A

Release notes

The Notification emails will stop to send html tag at subject.

Change Record

N/A

Translations

Notification from %site_name -> Notification from @site_name

[robertragas]

Merged and cherry-picked to 12.4.x