This is a fictional character / creature in the books/Universe of
"Hitchhikers Guide To the Galaxy" by Douglas Adams.
The Babel fish is a small, bright yellow fish, which can be placed in someone's ear in order for them to be able to hear any language translated into their first language.
If you can find a Babelfish, you may be able to solve this easier. If not, it shouldn't be too difficult. :)
Good Luck!