feat(polls): show voter count + open/closed status on the interact page
The poll footer on the interact page now reads the voter count with a proper
"voters" label and an explicit open/closed status (open also shows the closing
time). A closed poll shows the results (bars) instead of a ballot.
- src/views/pages/authorize-interaction.ejs — shared footer "N voters · open · closes …"
(open) / "N voters · closed" (closed); closed renders result bars, not the ballot.
- src/services/i18n.js — poll.open (nl/en/de).
Co-Authored-By: Claude <noreply@…>