Add indication for unverified volunteers (#45)

We want to have some indication for that some volunteers haven't confirmed their email.

Perhaps "unverified" is bad terminology, but until we have proper "verification" it will suffice.

(Ideally there would also be a filter, but my rails is way too rusty...)

Reviewed-on: #45
Co-authored-by: Tocho Tochev <tocho@tochev.net>
Co-committed-by: Tocho Tochev <tocho@tochev.net>

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