The Editor for ShEx shemas needs some smaller improvements:

1. The save button should be called "Publish changes" rather than "Submit", as usual for other Mediawiki text editors. The save button should have an accesskey="s" for keyboard shortcuts
2. When saving without a manually typed edit summary, there should be a warning if the user has enabled "Prompt me when entering a blank edit summary" in their preferences
3. There should be a "Show changes" button that shows a diff preview of already made changes, similarly as for wikitext pages. The "Show changes" button should have an accesskey="v" as usual