Add Prompt for "New Discussion" button

When the current page has a form that has been filled out, pressing the "New Discussion" button should prompt with a "Are you sure you want to do this?" style message.

If someone hits the "New Discussion" button instead on the submit button (presumably on accident), they are redirected away from the current form, and all of their work will be lost.

This has tripped me up on mobile a couple of times. I know it's user-error, but having a handy feature to prevent that from happening would be great.