<%= render partial: "error_page", locals: {
    title: "Sorry, there was a problem",
    heading: "Sorry, there was a problem",
    intro: '<p>We cannot show you the page you were expecting.</p>
      <p>Go back and try again.</p>',
    status_code: 422
} %>

Add new generic unprocessable entity page
Add new generic unprocessable entity page

Related to: https://github.com/alphagov/govuk-puppet/pull/10346

Extracted from: https://github.com/alphagov/email-alert-frontend/pull/743
