The language of the names of the books depends on the language of the Bible (and if the Bible has the names of the books translated). This is so that a Zulu Bible can have the names of the books in Zulu, rather than, let's say, German. If you are using, for example, a German Bible and it only has the books in English, then the Bible needs to be edited. If it's a web Bible, that's a different story.