I'm sure this is something that impacts a small percentage of users. So, European Portuguese and Brazilian Portuguese are not the same and there are usually different editions for each language. As an european portuguese I don't like to read in Brazilian, unless it is the original language for the book. It's not the same as reading the UK vs the US edition of a book, it's actually different the way the sentences are put together.
It would be nice to distinguish between the two and have the two options available. I usually have to look at the publisher to make sure I'm choosing the right edition. I'm not sure if this is something that applies to other languages, it might be.