The runes and both maps (the one for the Wildlands and the other one for the Lonely Mountain) are in Catalán. Some names, though, remain in English (such as Baggins or Took, which in The Lord of the Rings are translated as Saquet and Tuc respectively).

Source: The Annotated Hobbit (Revised and expanded edition, 2002) - Used with permission

Additional Information: http://leelibros.com/biblioteca/index.php?q=el_hobbit_o_viatge_danada_i_tornada