All my addons should be working with the spanish translation. If you find that any of my addons doesn't work or if you have traslated texts to spanish, let me know.
For many addons, you can find a file called fr, en, de (.lua) in the subfolders which contains strings to be traduced. As long many of us don't speak spanish, you can easily traduce your addons yourself and send us files
Russians already do like this and we generally implement them quickly.