Less stupid translation helper (with blocks for interpolation) until https://github.com/rails/rails/pull/13808 makes it into a version (and if at all)

less_stupid_translation_helper.rb

module LessStupidTranslationHelper
  include ActionView::Helpers::TranslationHelper

  class Interpolator

    attr_reader :variables

    def initialize(context)
      @variables = HashWithIndifferentAccess.new
      @context = context
    end

    private

    # XXX an alternative solution would be to define methods per interpolation variables
    def method_missing(meth, *args, &block)
      variables[meth] = args[0] || @context.capture(&block)
    end

  end

  def translate(key, options = {})
    if block_given?
      i = Interpolator.new(self)
      yield i
      options = i.variables.merge(options)
    end
    super key, options
  end
  alias_method :t, :translate

end