title: Customize Button And Success Message In Active Admin Rails
body: <p>I want to customize following things</p>
  
  <ol>
  <li>Actions Name like "Add User" => "Create User", "Edit User" => "Update User" etc  </li>
  <li>Success Message On Delete, Create and Edit like "user successfully created" => "customer successfully created"</li>
  <li>Add A Create Button On Show Page beside edit and delete </li>
  </ol>