Update send_confirmation_email_job.rb to explicitly send English and Welsh

Unfortunately have to discard relying on the I18n locale as we are using two languages at this point, whereas I18n will use whatever singular locale is set.

Author: chao-xian

app/jobs/send_confirmation_email_job.rb

@@ -5,19 +5,21 @@ class SendConfirmationEmailJob < ApplicationJob
   def perform(submission:, notify_response_id:, confirmation_email_address:)
     set_submission_logging_attributes(submission:)
 
-    I18n.with_locale(submission.submission_locale || I18n.default_locale) do
-      form = submission.form
-      mail = FormSubmissionConfirmationMailer.send_confirmation_email(
-        what_happens_next_markdown: form.what_happens_next_markdown,
-        support_contact_details: form.support_details,
-        notify_response_id:,
-        confirmation_email_address:,
-        mailer_options: mailer_options_for(submission:, form:),
-      )
+    form = submission.form
+    welsh_form = fetch_welsh_form(submission:, form:)
+    mail = FormSubmissionConfirmationMailer.send_confirmation_email(
+      what_happens_next_markdown: form.what_happens_next_markdown,
+      what_happens_next_markdown_cy: welsh_form&.what_happens_next_markdown,
+      support_contact_details: form.support_details,
+      support_contact_details_cy: welsh_form&.support_details || form.support_details,
+      notify_response_id:,
+      confirmation_email_address:,
+      mailer_options: mailer_options_for(submission:, form:),
+      submission_locale: submission.submission_locale,
+    )
 
-      mail.deliver_now
-      CurrentJobLoggingAttributes.confirmation_email_id = mail.govuk_notify_response.id
-    end
+    mail.deliver_now
+    CurrentJobLoggingAttributes.confirmation_email_id = mail.govuk_notify_response.id
   rescue StandardError
     CloudWatchService.record_job_failure_metric(self.class.name)
     raise
@@ -34,4 +36,15 @@ def mailer_options_for(submission:, form:)
       payment_url: submission.payment_url,
     )
   end
+
+  def fetch_welsh_form(submission:, form:)
+    return nil unless submission.submission_locale.to_sym == :cy
+
+    form_document = Api::V2::FormDocumentRepository.find_with_mode(
+      form_id: form.id,
+      mode: submission.mode_object,
+      language: :cy,
+    )
+    Form.new(form_document) if form_document
+  end
 end