Spanish language unfinished

I'm spanish and I like to finish the translation into spanish for the Directory Opus v.10 because I tried It and I saw it is unfinished.
I tried with "Resource Hacker" and I opened the "espanol.dll" file and I did some changes, but when I tried to load it with DOpus, it don't recognize it. Why?
is there any program/plugin for do it?
Thanks a lot!

If you want to offer to help translate Opus you should write to GPSoftware via the support link in my sig.

(BTW, the person who looks after translations is away for a few days so it might take longer than usual to get a reply.)