Lojban
From IFWiki
Lojban is an artificial or constructed language created in 1987. It is based on predicate logic, rather than nouns, verbs, and other standard parts of speech.
In 2002, Robin Lee Powell and Martin Bays translated the standard Inform library files into Lojban, and ((check this)) also translated Adventure (William Crowther and Donald Woods; 1976) into Lojban as nuntalyli'u. This is probably the only IF game that exists in Lojban.