add custom invitation reminder emails

app/models/account_config.rb

@@ -22,6 +22,7 @@
 #
 class AccountConfig < ApplicationRecord
   SUBMITTER_INVITATION_EMAIL_KEY = 'submitter_invitation_email'
+  SUBMITTER_INVITATION_REMINDER_EMAIL_KEY = 'submitter_invitation_reminder_email'
   SUBMITTER_COMPLETED_EMAIL_KEY = 'submitter_completed_email'
   SUBMITTER_DOCUMENTS_COPY_EMAIL_KEY = 'submitter_documents_copy_email'
   BCC_EMAILS = 'bcc_emails'
@@ -59,6 +60,12 @@ class AccountConfig < ApplicationRecord
         'body' => I18n.t(:submitter_invitation_email_sign_body)
       }
     },
+    SUBMITTER_INVITATION_REMINDER_EMAIL_KEY => lambda {
+      {
+        'subject' => I18n.t(:you_are_invited_to_sign_a_document),
+        'body' => I18n.t(:submitter_invitation_email_sign_body)
+      }
+    },
     SUBMITTER_COMPLETED_EMAIL_KEY => lambda {
       {
         'subject' => I18n.t(:template_name_has_been_completed_by_submitters),