<div id="feedback-complete" class="feedback-form-container">
  <p class="heading-xlarge">Thanks. We’ll be in touch in the future.</p>
</div>

<div id="feedback-complete" class="feedback-form-container">
  <p class="heading-xlarge">Thank you.</p>
</div>

Edit to thank you message.
Edit to thank you message.

Remove "we'll be in touch in the future" from thank you message.