how to use languages [solved]

[eluser]pyweb1[/eluser]
hi,

This may be an easy answered question but i can't find anything about it (maybe it's "too" easy!).

I would like my codeigniter errors to be in french. the file_uploading class report errors in English like this one

You did not select a file to upload.

I can't find a single tutorial or website telling step by step or to do that. i would like to find a french language pack and a tutorial to set the default language to french (autoload)?

thx a lot