Fixes#612. Ports in an existing working fix from upstream with
the change to bs_trigger. Also a stylistic improvement on the
preceding line I noticed while porting it.
bs_trigger is what attaches the event listeners for the Boostrap
popovers. It wasn't being called on the new elements, so they get no
user card. It is now, so it does. Calling it on the comment form
element doesn't work here because, unlike in an earlier stage of the
codebase (which I think the fork occured during the transition of)
put replies into a dedicated element rather than replacing the reply
form.
fdc6fa4181