Hi,
I can assure that the fact that the user receives the admin user account notification has been corrected with 2.1.2.
The admin will still receive it of course.
If you see the translation keys instead of the text, it means that you didn't update your translation files after the update.
You can go in the Languages tab of the configuration of HikaShop to load the latest version of the translation files from our server.
Also, you can always add them manually to your translation file:
HIKA_USER_ACCOUNT_ADMIN_NOTIFICATION_SUBJECT="Account Details for %s at %s"
HIKA_USER_ACCOUNT_ADMIN_NOTIFICATION_BODY="Hello administrator, <br/><br/>A new user '%s', username '%s', has registered at %s."
Finally, that email can also be disabled via the menu System>Emails by unpublishing the "user account admin notification".