Set globalize fallbacks for requests

New version of globalize uses RequestStore gem to store I18n.locale and
Globalize.fallbacks in a per request basis to avoid collissions between
different requests. This gem update broke Globalize.fallback results
because it tries to fetch fallbacks from RequestStore, where there is no
locale fallbacks definition.

app/controllers/application_controller.rb

@@ -10,6 +10,7 @@ class ApplicationController < ActionController::Base
   before_action :set_locale
   before_action :track_email_campaign
   before_action :set_return_url
+  before_action :set_fallbacks_to_all_available_locales
 
   check_authorization unless: :devise_controller?
   self.responder = ApplicationResponder
@@ -128,4 +129,8 @@ class ApplicationController < ActionController::Base
     def current_budget
       Budget.current
     end
+
+    def set_fallbacks_to_all_available_locales
+      Globalize.set_fallbacks_to_all_available_locales
+    end
 end