Déjà Vu does not display a list of languages in the TMX Translation Memory Import Wizard

If you are attempting to import the content of a TMX Translation Memory and, when you reach the "Specify Language Conversion" page of the Import Wizard you see an empty list, you are most likely dealing with a TMX translation memory that contains characters or entities not allowed by the TMX standard, or is otherwise malformed or corrupted. Déjà Vu cannot work with TMX files that have these problems.

This article explains what you can do if the TMX file you want to import has illegal characters.