Email Frequency not translating in email

Problem/Motivation

When you send an email with the footer with a users notification settings the whole string except the frequency gets translated, even if the frequency string is translated in drupal.

This is the code with the issue
social/modules/custom/activity_send/modules/activity_send_email/src/Plugin/EmailFrequency/Immediately.php
line 141

// Translating frequency instance in the language of the user.
    $frequency_translated = $this->t('@frequency_name', [
      '@frequency_name' => $this->getName()->getUntranslatedString(),
    ],
      ['langcode' => $langcode]
    );

Steps to reproduce

• Translate the string 'Immediatly' into another language, for German for example into 'Sofort'
• Have a user with your email address where certain email notifications on
• trigger that notification
• Trigger cron to go through the created queue items
• Check email footer.

Proposed resolution

change code to this:

    // Translating frequency instance in the language of the user.
    $frequency_translated = $this->t($this->getName()->getUntranslatedString(), [],
      ['langcode' => $langcode]
    );

Remaining tasks

• Someone check the code

User interface changes

API changes

Data model changes