Add controller concern to initialize Globalize fallbacks

Ensure to initialize all requests including this concern into all
application base controllers.

app/controllers/concerns/globalize_fallbacks.rb

@@ -0,0 +1,13 @@
+module GlobalizeFallbacks
+  extend ActiveSupport::Concern
+
+  included do
+    before_action :initialize_globalize_fallbacks
+  end
+
+  private
+
+    def initialize_globalize_fallbacks
+      Globalize.set_fallbacks_to_all_available_locales
+    end
+end