Josiah Quincy writes to wife about visiting Joseph, mentions that Joseph translated hieroglyphs.
Josiah Quincy, Letter to Mary Jane Miller Quincy, May 16, 1844, in Jed Woodworth, "Josiah Quincy's 1844 Visit with Joseph Smith," BYU Studies 39, no. 4 (2000): 86–87
We passed the whole day in his society & had one of the most extraordinary conversations I ever participated in, he preached for us, prophesied for us, interpreted hieroglyphics for us, exhibited his mummies and took us to his temple which he is now erecting on a most majestic site of hewn stone.