add personalization settings

app/mailers/submitter_mailer.rb

@@ -4,15 +4,26 @@ class SubmitterMailer < ApplicationMailer
   DEFAULT_MESSAGE = %(You have been invited to submit the "%<name>s" form:)
 
   def invitation_email(submitter, message: '')
+    @current_account = submitter.submission.template.account
     @submitter = submitter
     @message = message.presence || format(DEFAULT_MESSAGE, name: submitter.submission.template.name)
 
+    @email_config = @current_account.account_configs.find_by(key: AccountConfig::SUBMITTER_INVITATION_EMAIL_KEY)
+
+    subject =
+      if @email_config
+        ReplaceEmailVariables.call(@email_config.value['subject'], submitter:)
+      else
+        'You have been invited to submit a form'
+      end
+
     mail(to: @submitter.email,
-         subject: 'You have been invited to submit a form',
+         subject:,
          reply_to: submitter.submission.created_by_user&.friendly_name)
   end
 
   def completed_email(submitter, user)
+    @current_account = submitter.submission.template.account
     @submitter = submitter
     @user = user
 
@@ -21,6 +32,7 @@ class SubmitterMailer < ApplicationMailer
   end
 
   def documents_copy_email(submitter)
+    @current_account = submitter.submission.template.account
     @submitter = submitter
 
     Submissions::EnsureResultGenerated.call(@submitter)