I am not sure to understand what message you write about, however all messages seem to be translatable inside dedicated aggregate group thanks to Tacsipacsi
I mean on a message in a big yellow box which says "Translation admins: Please do not mark this page for translation while it's still a draft. The content of the newsletter is simplified before being marked for translation, and marking it for translation before that's done increases the work of volunteer translators. Thank you!".
If template is translatable, then it should be added into the group.