FIX: Use correct translation string

plugins/poll/plugin.rb

@@ -75,7 +75,7 @@ after_initialize do
             poll_groups = poll.groups.split(",").map(&:downcase)
             user_groups = user.groups.map { |g| g.name.downcase }
             if (poll_groups & user_groups).empty?
-              raise StandardError.new I18n.t("js.poll.results.groups.title", group: poll.groups)
+              raise StandardError.new I18n.t("js.poll.results.groups.title", groups: poll.groups)
             end
           end
 

plugins/poll/spec/controllers/polls_controller_spec.rb

@@ -195,7 +195,7 @@ describe ::DiscoursePoll::PollsController do
 
       expect(response.status).not_to eq(200)
       json = ::JSON.parse(response.body)
-      expect(json["errors"][0]).to eq(I18n.t("js.poll.results.groups.title", trust_level: 2))
+      expect(json["errors"][0]).to eq(I18n.t("js.poll.results.groups.title", groups: poll.polls.first.groups))
     end
 
     it "doesn't discard anonymous votes when someone votes" do