Auto Translation of conversation PDFs into bot owner's language

When the PDF copy of a conversation between a user and the bot is emailed to the bot owner it comes through in the language of the user. It would be good if these were automatically translated into the language of the bot owner. e.g. the user speaks to the bot in Mandarin so the PDF sent is in Mandarin, but as the bot owner only speak English, so i therefore have to copy and paste the contents into Google Translate to read what was said.