Add polls (#10111)

* Add polls

Fix #1629

* Add tests

* Fixes

* Change API for creating polls

* Use name instead of content for votes

* Remove poll validation for remote polls

* Add polls to public pages

* When updating the poll, update options just in case they were changed

* Fix public pages showing both poll and other media

app/validators/vote_validator.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class VoteValidator < ActiveModel::Validator
+  def validate(vote)
+    vote.errors.add(:base, I18n.t('polls.errors.expired')) if vote.poll.expired?
+
+    if vote.poll.multiple? && vote.poll.votes.where(account: vote.account, choice: vote.choice).exists?
+      vote.errors.add(:base, I18n.t('polls.errors.already_voted'))
+    elsif vote.poll.votes.where(account: vote.account).exists?
+      vote.errors.add(:base, I18n.t('polls.errors.already_voted'))
+    end
+  end
+end