I prefer to read a book in it's original language (if I am able to do so). Some of the books might take me a few years as I might not be as fluent as I wish to.
I also like to read books in original language AND translation, just to see if I got it right (or if the translator got it right).
Some of the translation are great, others not so.
And if a book is not available in a language that I can read then it's kind of my problem isn't it?