Mark as complete

Is there any way to disable, hide, remove “mark as complete” button from course page? I’m making course for kids, this seems like super confusing future, when they need to press “mark as complete” before moving to next chapter.

Also I see that buttons like “mark as complete” or “enroll” , “start learning” are in English. Since I do course for kids that are not English speakers, can I translate those buttons anyhow?

Also is there any way to implement multiple good answers for same filed in ‘fill the blank’ question?