Yes, that's true. With manuals of computer programs, I usually want to read the English manual even if there's a translation available.

There can be exceptions though. I've read the Hungarian translation of the Owl book, and it was quite good.

The big problem is that the translation of terminology isn't quite standard, as there are so few translated books, so even if a translation is fine, you might not understand it. I guess this could be less of a problem in Spanish or French though.