Update "newsletter" notification email to add unsubscribe link

app/mailers/mailer.rb

@@ -120,6 +120,7 @@ class Mailer < ApplicationMailer
   def newsletter(newsletter, recipient_email)
     @newsletter = newsletter
     @email_to = recipient_email
+    manage_subscriptions_token(User.find_by(email: @email_to))
 
     mail(to: @email_to, from: @newsletter.from, subject: @newsletter.subject)
   end

app/views/mailer/newsletter.html.erb

@@ -2,4 +2,15 @@
   <p style="font-family: 'Open Sans','Helvetica Neue',arial,sans-serif;font-size: 14px;line-height: 24px;">
     <%= auto_link_already_sanitized_html wysiwyg(@newsletter.body) %>
   </p>
+
+  <p style="font-family: 'Open Sans','Helvetica Neue',arial,sans-serif;font-size: 12px;font-weight: normal;line-height: 20px;">
+    <%= sanitize(t("mailers.config.unsubscribe_text",
+      notifications: link_to(
+        t("mailers.config.notifications_link"),
+        edit_subscriptions_url(token: @token),
+        style: "color: #2895F1; text-decoration: none;"
+      ),
+      notification: User.human_attribute_name(:newsletter)
+    )) %>
+  </p>
 </td>

config/locales/en/mailers.yml

@@ -8,7 +8,6 @@ en:
       subject: Someone has commented on your %{commentable}
       title: New comment
     config:
-      manage_email_subscriptions: To stop receiving these emails change your settings in
       notifications_link: Notifications
       unsubscribe_text: 'To unsubscribe from these emails, visit %{notifications} and uncheck "%{notification}".'
     email_verification:

config/locales/es/mailers.yml

@@ -8,7 +8,6 @@ es:
       subject: Alguien ha comentado en tu %{commentable}
       title: Nuevo comentario
     config:
-      manage_email_subscriptions: Puedes dejar de recibir estos emails cambiando tu configuración en
       notifications_link: Notificaciones
       unsubscribe_text: 'Para darse de baja de estos emails, puedes entrar en %{notifications} y desmarcar la opción "%{notification}".'
     email_verification:

spec/system/emails_spec.rb

@@ -502,6 +502,10 @@ describe "Emails" do
       expect(email).to have_subject("This is a different subject")
       expect(email).to deliver_from("no-reply@consul.dev")
       expect(email.body.encoded).to include("This is a different body")
+      expect(email).to have_body_text("To unsubscribe from these emails, visit")
+      expect(email).to have_body_text(
+                        edit_subscriptions_path(token: user_with_newsletter_in_segment_2.subscriptions_token))
+      expect(email).to have_body_text('and uncheck "Receive by email website relevant information"')
     end
   end