This is what it means, it's a certified translation. Certified by a professional translator (sometimes a sworn translator). In some countries they're even notarized.
115 EUR is not so much for 13 pages. Depends also on how much text there is on your bank statement. Are you sure you have a bank statement? Your terminology (bank history) is weird. Please refer to my reply under your other post. Does it show your name at least?
From Google: "Australian citizens need a visa to enter Vietnam. The most convenient way to obtain one is through the Vietnam e-visa, which allows for stays of up to 90 days with single or multiple entries."