There is a "translate" symbol in my version (5.1). It is a pair of cartoon speech bubbles with a capital letter A in one and a (possibly Kanji) character in the other. It has a note that it is reserved for the Apple translate service, so I presume it is copyrighted. I am personally going to use the "globe" symbol to offer other languages. Don't know if there are any HID guidelines on that.

@Scott and @endecotp, thank you both. The figure search gave me what I wanted!