Currently, the acknowledgement text of a form will not be submitted into a web page. In the web page you will have a standard acknowledgement text that you have to adjust separately. This means, you have to change the text in the original form and in the page editor, which means a lot of work if you use plenty of forms.
My suggestion is: The acknowledgement text of a form will automatically be delivered into the web page editor and you only have to change it there, if you want a different acknowledgement text on the web page.