Remove unneded before validation callbacks

After globalize gem update there is no need to keep this monkey patch.

More information here [1]

[1] 3075c89b70

app/models/budget.rb

@@ -22,8 +22,6 @@ class Budget < ApplicationRecord
 
   CURRENCY_SYMBOLS = %w(€ $ £ ¥).freeze
 
-  before_validation :assign_model_to_translations
-
   validates_translation :name, presence: true
   validates :phase, inclusion: { in: Budget::Phase::PHASE_KINDS }
   validates :currency_symbol, presence: true

app/models/budget/group.rb

@@ -22,8 +22,6 @@ class Budget
 
     has_many :headings, dependent: :destroy
 
-    before_validation :assign_model_to_translations
-
     validates_translation :name, presence: true
     validates :budget_id, presence: true
     validates :slug, presence: true, format: /\A[a-z0-9\-_]+\z/

app/models/budget/heading.rb

@@ -26,8 +26,6 @@ class Budget
     has_many :investments
     has_many :content_blocks
 
-    before_validation :assign_model_to_translations
-
     validates_translation :name, presence: true
     validates :group_id, presence: true
     validates :price, presence: true

app/models/concerns/globalizable.rb

@@ -9,10 +9,6 @@ module Globalizable
       translations.reject(&:_destroy).map(&:locale)
     end
 
-    def assign_model_to_translations
-      translations.each { |translation| translation.globalized_model = self }
-    end
-
     def description
       self.read_attribute(:description).try :html_safe
     end

app/models/progress_bar.rb

@@ -18,7 +18,6 @@ class ProgressBar < ApplicationRecord
             }
   validates :percentage, presence: true, inclusion: RANGE, numericality: { only_integer: true }
 
-  before_validation :assign_model_to_translations
   validates_translation :title, presence: true, unless: :primary?
 
 end