[Koha-translate] Problems with translation in catalan

Hello, I've been trying to translate Koha in Catalan so I've registered myself in http://translate.koha.org, following the instructions on the "Pootle's How to" once I choose the language and the project I should obtain the files available for tranlation but there's nothing to download. Can anyone help me with that question? How can I get the files to tranalate? Thanks in advance, Cristina Vaquer