Output debugging information about i18n translation lookups that are occurring.

i18n_debug.rb

    require 'i18n'

    if (Rails.env.development? || Rails.env.test?) && ENV['DEBUG_TRANSLATION']
      module I18n
        class << self
          def translate_with_debug(*args)
            puts "Translate: #{args.inspect}"
            translate_without_debug(*args)
          end
          alias_method_chain :translate, :debug
        end
      end
    end