While some books of perl (and even some of the core perldocs) are available in translation
And usually those translations are of very bad quality, because the translators know nothing or very little about perl (or xml, databases, or whatever).
Once I bought a book about COM that was a translation from English to Spanish. But the translation was so bad that the only way to understand it, was to untranslate it back to English on my mind at the same time I was reading it, trying to find the original wording that actually made sense!