def [](word)
      h = {}
      language_codes.each do |language_code|
        h[language_code] = lookup_hash[language_code][word] || DEFAULT_VALUE
      end
      h
    end
def [](word)
      h = {}
      language_codes.each do |language_code|
        h[language_code] = lookup_hash[language_code][word] || DEFAULT_VALUE
      end
      h
    end
TODO: We could add memoization, but this will increase memory usage a lot