Mark reply text as markdown after publishing the reply.
When writing a reply to a review, the comment would properly appear

as Markdown, until it was published. It would then suddenly appear as

plain text. This happened because we rebuilt the reply element, but

never called formatText on it.
Now, if there's text provided when building the element, we call

formatText on it.

Replied to a comment with some Markdown text and hit Publish. It appeared

as rendered Markdown.
JS unit tests pass.