handle template archived

app/controllers/submissions_controller.rb

@@ -38,6 +38,8 @@ class SubmissionsController < ApplicationController
   end
 
   def create
+    return redirect_to template_path(@template), alert: I18n.t('template_has_been_archived') if @template.archived_at?
+
     save_template_message(@template, params) if params[:save_message] == '1'
 
     [params.delete(:subject), params.delete(:body)] if params[:is_custom_message] != '1'