Contest language & top buttons

app/controllers/contests_controller.rb

@@ -70,6 +70,8 @@ class ContestsController < ApplicationController
     end
     authorize @contest
 
+    I18n.locale = @contest.lang
+
     @title = I18n.t("contests.scoreboard.title", name: @contest.name)
     @contestants = @contest.contestants.sort_by { |contestant| [ -contestant.completions.size, contestant.time_seconds ] }
     @puzzles = @contest.puzzles.order(:id)
@@ -89,6 +91,6 @@ class ContestsController < ApplicationController
   end
 
   def contest_params
-    params.expect(contest: [ :name, :team, :allow_registration ])
+    params.expect(contest: [ :lang, :name, :team, :allow_registration ])
   end
 end