add more status updates

templates/emails/completed.body.txt

@@ -0,0 +1,19 @@
+Hi,
+
+Your hamprint is done! "{{ submission.slug }}" came off the printer
+successfully and is waiting for you at hamlab.lt.
+
+    Codename : {{ submission.slug }}
+    Status   : Completed
+{% if submission.operator_notes %}
+A note from the operator:
+
+    {{ submission.operator_notes }}
+{% endif %}
+Come grab it whenever the lab is open. Thanks for printing with us!
+
+Pickup details and a photo (if the operator left one) are here:
+    {{ detail_url }}
+
+— hamprint
+{{ site_url }}