Add indication for unverified volunteers

app/views/management/volunteers/index.csv.erb

@@ -3,7 +3,7 @@
 <%- @volunteers.each do |volunteer| -%>
   <%= CSV.generate_line([volunteer.id,
                          volunteer.name,
-                         volunteer.email,
+                         "#{volunteer.confirmed_at.nil? ? '(unverified) ' : ''}#{volunteer.email}",
                          volunteer.language,
                          volunteer.unique_id,
                          volunteer.phone,

app/views/management/volunteers/index.html.slim

@@ -48,7 +48,7 @@
                     h4.media-heading
                       = volunteer.name
                     p
-                      = icon(:envelope, volunteer.email)
+                      = icon(volunteer.confirmed_at.present? ? "envelope" : "envelope-o", "#{volunteer.confirmed_at.nil? ? '(unverified) ' : ''}#{volunteer.email}")
               td
                 = volunteer.volunteer_team.name
               td.actions

app/views/management/volunteers/show.html.slim

@@ -38,7 +38,7 @@
         h4 = t '.other_info'
         = icon(:language, t("locales.#{@volunteer.language}"))
         br
-        = icon(:envelope, @volunteer.email)
+        = icon(@volunteer.confirmed_at.present? ? "envelope" : "envelope-o", @volunteer.email)
         br
         = icon(:phone, @volunteer.phone.try(:phony_formatted, format: :international))
         br