The "Submit" button element should be able to take button text as an argument

[JamesPHoughton]

Currently I believe the button just says "Next". We should be able to override this default in the treatment definition to make it say things like "I'm ready", etc. Should be a pretty easy fix.

For example, say that the treatment file has this syntax:

          - type: submitButton
            buttonText: Continue with experiment
            displayTime: 1590

Implementing notes:

• [ ] Need to parse in client/src/elements/Element.jsx in the submitButton case should take the buttonText attribute from the treatment file using syntax element.buttonText and pass to object.
• [ ] in client/src/elements/SubmitButton need to set the inner HTML that currently says Next with the optional text,
• [ ] if there is no optional text, default to Next

Testing

Update the test to check that this works

• [ ] deliberation-assets/projects/example/treatments.test.yaml - add a button component with some custom text
• [ ] cypress/e2e/01_Normal_Paths... need to check that the button custom text is displayed on the page at the appropriate time.

[JamesPHoughton]

Ready to review the PR!

[mxumary]

PR here https://github.com/Watts-Lab/deliberation-empirica/pull/481

[JamesPHoughton]

Complete in https://github.com/Watts-Lab/deliberation-empirica/pull/481