refactor prereg text for closed/open/sold out into external templates

@kitsuta might want to have a close look at this just to make sure I didn't screw up.

tested with all 3 status for open/closed/sold out, looks solid.

ALSO: bumped up the default badge cap to 19,000 from seemingly arbitrarily set 13,000 so if we forget about it for Magfest 13, at least it's a sane default and people don't freak out when we hit an arbitrary cap :)

Since it's simple, I'm going to merge this, but definitely have a look and review it.