AO3-6814 Enable translated emails for archivist__added_to_collection_notification

Author: indesotw

app/models/collection_item.rb

@@ -106,11 +106,13 @@ def notify_archivist_added
     item.users.each do |email_recipient|
       next if email_recipient.preference.collection_emails_off
 
-      UserMailer.archivist_added_to_collection_notification(
-        email_recipient.id,
-        item.id,
-        collection.id
-      ).deliver_later
+      I18n.with_locale(email_recipient.preference.locale.iso) do
+        UserMailer.archivist_added_to_collection_notification(
+          email_recipient.id,
+          item.id,
+          collection.id
+        ).deliver_later
+      end
     end
   end
 

features/collections/collection_notification.feature

@@ -63,3 +63,20 @@ Feature: Collectible items email
       And I fill in "bookmark_collection_names" with "dont_bookmark_me_bro"
       And I press "Create"
     Then 1 email should be delivered
+
+  Scenario: Archivist adds work to collection
+    Given I am logged in as "regular_user"
+      And I post the work "Collection Work"
+      And a locale with translated emails
+      And the user "regular_user" enables translated emails
+      And I have an archivist "archivist"
+    When all emails have been delivered
+      And I am logged in as "archivist"
+      And I create the collection "Open Doors Collection" with name "open_doors_collection"
+      And I view the work "Collection Work"
+      And I follow "Add to Collections"
+      And I fill in "collection_names" with "open_doors_collection"
+      And I press "Add"
+    Then I should see "Added to collection(s): Open Doors Collection"
+      And 1 email should be delivered
+      And the email to "regular_user" should be translated    

test/mailers/previews/user_mailer_preview.rb

@@ -60,6 +60,13 @@ def admin_deleted_work_notification
     UserMailer.admin_deleted_work_notification(user, work)
   end
 
+  def archivist_added_to_collection_notification
+    work = create(:work)
+    collection = create(:collection)  
+    user = create(:user, :for_mailer_preview)
+    UserMailer.archivist_added_to_collection_notification(user.id, work.id, collection.id)
+  end
+
   private
 
   def creatorship_notification_data(creation_type)