Unescape content from jipt before updating the component.

Summary:
It doesn't seem like crowdin is unescpaing its input before trying to update
the div, so we have to do it for them.

Test Plan:
make all
http://en-pt.khanacademy.dev/preview/content/items/x749a4286
See the answer rendered correctly.
Mouse over and click the jipt icon.
Update the translation and see the answer box show the new translation.

Reviewers: alpert

CC: jack, alpert

Differential Revision: http://phabricator.khanacademy.org/D7069