By default, these buttons are generated using the get_submit_button() API function, but that function is only available in the admin dashboard (unless explicitly loaded). Previously, the buttons were not shown in the front end.
This patch adds a fallback that generates the buttons directly. These won't look exactly the same as admin buttons due to admin styles not being loaded, and WP may change submit button HTML at some point, but the fallback buttons should still work.
Fixes#568
David Anderson
Yahnis Elsts
Mehbub Rashid