After spending a couple of days translating from english to spanish, here is the result of Diferior completely in spanish.
To install the translation, you have to:
1.- Paste the sp.php file into the 'languages' directory.
2.- Open the language_list.php file and add this new line:
array ( 'title' => 'Spanish', 'own_title' => 'Español', 'author' => 'ElGartzi', 'file' => 'sp' ),
I have not checked it with the BETA version of Diferior (I just downloaded 8.03 version and started doing the translation), so I can not say if it works properly with the BETA version or not.
Time format has to be changed, because in spanish the format is not year/month/day but day/month/year.
Apart from that, I think that everything is OK.
If you consider that something is not correctly translated or that it should be written in a different way, do not hesitate to write comments with your suggestion(s).
Thanks and enjoy it!