add "hide steps" button, and explain ramifications

"Show steps" now has text next to it saying what will happen to your score when you click it.
There's a "hide steps" button to close the steps if you don't want to see them any more.

JME/numberentry/patternmatch parts with steps now have an "Answer: " prompt next to the input box to give it some context. The prompt isn't there when there are no steps.add "hide steps" button, and explain ramifications

"Show steps" now has text next to it saying what will happen to your score when you click it.
There's a "hide steps" button to close the steps if you don't want to see them any more.

JME/numberentry/patternmatch parts with steps now have an "Answer: " prompt next to the input box to give it some context. The prompt isn't there when there are no steps.

New localisation strings:
	'question.show steps penalty': "you will lose <strong>%s</strong> %s",
	'question.show steps no penalty': "(no penalty)",
	'question.hide steps': "Hide steps",
	'question.hide steps no penalty': "your score will not be affected",
	'part.with steps answer prompt': 'Answer: ',

resolves numbas/editor#173