Create alter hook for template map being used

All what is left are code style issues which are addressed in #3422332

This is working super-nicely. Used it to switch to a different template depending on the current interface language.

use Drupal\mailchimp_transactional_template\Entity\TemplateMap;

/**
 * Implements hook_mailchimp_transactional_template_map_alter().
 */
function MYMODULE_mailchimp_transactional_template_map_alter(TemplateMap &$template_map, $module_key, $module) {
  if (\Drupal::languageManager()->getCurrentLanguage()->getId() === 'is') {
    $template_map->set('template_name', 'icelandic-mail');
  }
}

--

Raising prio due to inactivity.

@Ruuds – You can link to other issues from within a comment like that: \[\#3422332\]. 🙂

See https://drupal.stackexchange.com/a/273180/15055

I left a comment in the MR.

@leymannx inactivity is not a reason to raise the priority of issues, especially not when it's about a feature request. Please stop doing this.

Feature requests may be marked major based on their value to the project overall and/or the scope of work to complete them. Major feature requests are often identified by core product managers, initiative coordinators, or subsystem or topic maintainers.

Examples of major features:

Providing a better UX for creating, editing & managing draft revisions

From https://www.drupal.org/docs/develop/issues/fields-and-other-parts-of-an-... →

But yeah, I should have justified it. And it's still up to the maintainers to decide if it's justified.

And I also remembered this inactivity=major correlation from security advisory coverage review queue. Which of course does not apply here.

I apologize.