Order translations using ruby

Joining the translations table caused duplicate records to appear.
Ordering with SQL is simply too hard because we need to consider
fallback locales.

Thanks Senén for providing most of the tests in the poll spec.

app/models/poll.rb

@@ -49,7 +49,19 @@ class Poll < ApplicationRecord
   scope :not_budget,    -> { where(budget_id: nil) }
   scope :created_by_admin, -> { where(related_type: nil) }
 
-  scope :sort_for_list, -> { joins(:translations).order(:geozone_restricted, :starts_at, "poll_translations.name") }
+  def self.sort_for_list
+    all.sort do |poll, another_poll|
+      if poll.geozone_restricted? == another_poll.geozone_restricted?
+        [poll.starts_at, poll.name] <=> [another_poll.starts_at, another_poll.name]
+      else
+        if poll.geozone_restricted?
+          1
+        else
+          -1
+        end
+      end
+    end
+  end
 
   def self.overlaping_with(poll)
     where("? < ends_at and ? >= starts_at", poll.starts_at.beginning_of_day,