Add verified cert image to email template

Make image url in the task and pass to template

openedx/core/djangoapps/schedules/tasks.py

@@ -6,6 +6,7 @@ from celery.task import task
 from django.conf import settings
 from django.contrib.auth.models import User
 from django.contrib.sites.models import Site
+from django.contrib.staticfiles.templatetags.staticfiles import static
 from django.core.exceptions import ValidationError
 from django.core.urlresolvers import reverse
 from django.db.models import F, Min
@@ -285,6 +286,7 @@ def _upgrade_reminder_schedules_for_bin(target_day, bin_num, org_list, exclude_o
 
             # This is used by the bulk email optout policy
             'course_ids': course_id_strs,
+            'cert_image': absolute_url(static('course_experience/images/verified-cert.png')),
         })
 
         yield (user, first_schedule.enrollment.course.language, template_context)

openedx/core/djangoapps/schedules/templates/schedules/edx_ace/upgradereminder/email/body.html

 {% extends 'schedules/edx_ace/common/base_body.html' %}
 {% load i18n %}
+{% load static %}
 
 {% block preview_text %}
     {% blocktrans trimmed %}
@@ -29,14 +30,27 @@
                 {% endblocktrans %}
             </p>
 
+            <a href="{{ course_url }}">
+                <img
+                    src="{{ cert_image }}"
+                    alt="{% blocktrans %}Example print-out of a verified certificate{% endblocktrans %}"
+                    style="
+                        display: block;
+                        margin-right: auto;
+                        margin-left: auto;
+                        margin-top: 50px;
+                        margin-bottom: 50px;
+                        border-top: 1px solid lightgray;
+                        border-bottom: 3px solid lightgray;
+                        border-right: 3px solid lightgray;
+                        border-left: 1px solid lightgray;
+                " />
+            </a>
+
             <p>
                 <!-- email client support for style sheets is pretty spotty, so we have to inline all of these styles -->
                 <a
-                {% if course_ids|length > 1 %}
-                    href="{{ dashboard_url }}"
-                {% else %}
                     href="{{ course_url }}"
-                {% endif %}
                     style="
                         color: #ffffff;
                         text-decoration: none;