Show inactive label on user roster page

Fixes CNVS-28046

Test plan:
 - Create a user
 - Enroll the user in a course
 - On the "people" tab, click on the user's name
 - Click "more user details..."
 - Ensure that neither "inactive" nor "completed" appear below
  the "created ..." line
 - Go back to the "people" tab
 - Click the cog menu next to the user's name, then click
   "deactivate" and click "ok" in the resulting prompt
 - Click on the user's name
 - Click "more user details..."
 - Ensure that "inactive" appears below the "created ..." line
 - Click "conclude this enrollment"
 - Ensure that "concluded" appears below the "created ..." line

Change-Id: I5ea34ce30aa2e88bf5de72e3155f988eb27f708d
Reviewed-on: https://gerrit.instructure.com/74599
Tested-by: Jenkins
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>
QA-Review: August Thornton <august@instructure.com>
Product-Review: Alex Boyd <aboyd@instructure.com>

Author: javawizard

app/views/context/roster_user.html.erb

@@ -107,7 +107,15 @@
                       :wrapper => '<span class="associated_user_name">\1</span>' %>
                 </div>
               <% end %>
-              <div style="font-size: 0.8em; padding-left: 20px; <%= hidden unless enrollment.completed? %>" class="completed_at_holder"><%= t 'completed_enrollment', "completed *%{completed_at}*", :completed_at => datetime_string(enrollment.completed_at), :wrapper => '<span class="completed_at">\1</span>' %></div>
+              <div style="font-size: 0.8em; padding-left: 20px; <%= hidden unless enrollment.completed? || enrollment.inactive? %>" class="completed_at_holder">
+                <% if enrollment.inactive? %>
+                  <%= t 'inactive' %>
+                <% elsif enrollment.completed_at %>
+                  <%= t 'completed_enrollment', "completed *%{completed_at}*", :completed_at => datetime_string(enrollment.completed_at), :wrapper => '<span class="completed_at">\1</span>' %>
+                <% else %>
+                  <%= t 'completed' %>
+                <% end %>
+              </div>
             </td>
             <% if enrollment.admin? ? (can_manage_admins && enrollment.user_id != @current_user.id) : can_manage_students %>
               <td style="vertical-align: top; padding: 5px; font-size: 0.8em;">