All of the Pega support guides are available in English language only. You can download the required guides, open them in Google Chrome and then leverage the Chrome's page translating functionality based on language.
You can do this by going to the Advanced settings->Language->Selecting a language of your choice. Relaunch the Chrome and then view the desired support guide.
Also, there are multiple converters available online which translates a document's language into your preferred language.