changing date's output

[andrej hocevar]

hello
i'd like to change the names of the months into slovenian ones, that is
the old-style names (like vinotok for october). Of course, there are the
locale files sl_SI, among them the LC_TIME, which states only those
'international' names. now i'd simply like to change that but i don't know
how to do it, since i don't know the format of that very file, so only
adding new names results in bad output.
can anyone help me here?
thanks,
andrej hocevar