Steps to reproduce:
- Go to en.wikipedia.org (or any other language-version of Wikipedia)
- Enable 2017 wikitext editor in Beta settings
- Open any article and click the Edit tab
- Make an edit and click Publish changes
- Enter an edit summary
- Click Review your changes
Expected result: below "Preview of edit summary:" there should be a preview of the edit summary
Actual result: below "Preview of edit summary:" is just a placeholder ($1) instead of the preview