Yes. I have changed the language to Spanish in my system settings to get a New Years thing only available to Spain, and the animals all spoke Spanish.
Intresting Sidenote, Harvey -and possibly the animal residents- will have different dialogue, so I recommend changing the language every now and then if you can read more than one language.
That is really cool!Does this work for the North American version or does this only work for the PAL version?
I forget what PAL means, but I have the NA Nintendo with the NA game. I'll change my language in system settings to Spanish the day before New Years Day (so the eve) then play in New Years Day and get the 12 grape plate. However I can not get the European New Years Gift by changing my language to French. I've tried. Since I can't change my language to Japanese at all, I haven't been able to get the Japanese New Years gift either.