They get changed from "lith" to "litho" because of the spellcheck in Word, exact same thing happened to me and that was the explanation I got from the person organising it. From there it gets changed to "lithograph" because people think they're smarter than they are. I was in one exhibition where one of my prints was just reworded with "Photography" as the medium, because they thought "photogravure" was a typo on my part.
"Silver Gelatine photograph" is probably the easiest thing for people to stomach. The public don't give half a crap about how much time and pain we went through for a print, as long as it looks nice.