Carlos, please update sr@Latn name

[Danilo Segan <dsegan gmx net>]

"sp" code is now defunct and obsolete (though, it might be relevant for 
Gnome 1.4, I haven't quite checked), and I hope I have now removed all 
references to it (namely, from Pan). So, if it's any good, you may 
remove the name for "sp".

The "sr" code is for "Serbian" language (so it stays the same), and 
newly added "sr@Latn" is for "Serbian Latin" ("Serbian in Latin 
script"). Please update names for statistics pages.

Thanks,
Danilo