currently neither Hugo itself nor the Golang’s templating language provide a way to translate timestamps. I guess you’re referring to the name of months in your example.
However, some folks in the community came up with a workaround that should do the trick. The docs provide an example on how to do it with the help of data files. Have a look at the “customize dates” section.
I use the above trick to add Croatian names for months, but considering that in Croatian language we have 7 cases the word is changing due to declination, I wonder if someone is familiar with the status of “Go does not yet have support for internationalized locales,” and/or can provide some (simple) workaround?