I subscribed to the weblate and tried really hard to find but wasn’t able to locate the “locale.po” page for pt_BR to edit.
Isn’t really a problem of translation, but missing lines from the code itself inside the locale file.
In the Search box, try entering user.subscriptions.expires and user.subscriptions.expired. This should show the current translations of those keys, where the {$date} is missing. You should be able to make changes there.
Regards,
Alec Smecher
Public Knowledge Project Team