Fix queries and scopes after column deletion

Some queries were accessing original column instead of the new translatable one. This should have been causing unexpected behavior for requests maded in a different locale than the application default.

app/models/budget/group.rb

@@ -28,7 +28,7 @@ class Budget
     validates :budget_id, presence: true
     validates :slug, presence: true, format: /\A[a-z0-9\-_]+\z/
 
-    scope :sort_by_name, -> { includes(:translations).order(:name) }
+    scope :sort_by_name, -> { joins(:translations).order(:name) }
 
     def single_heading_group?
       headings.count == 1

app/models/user.rb

@@ -128,7 +128,7 @@ class User < ActiveRecord::Base
   end
 
   def headings_voted_within_group(group)
-    Budget::Heading.order("name").where(id: voted_investments.by_group(group).pluck(:heading_id))
+    Budget::Heading.joins(:translations).order("name").where(id: voted_investments.by_group(group).pluck(:heading_id))
   end
 
   def voted_investments