You can customize the front-end interface to any language of your choice. In fact you can go to the online Settings section of the Blog and customize every piece of wording for the visitor; so not only you can have it in the language of your choice, but you can decide on the exact wording of the frontend elements too. Also there are options to customize the date formatting and name of the months, so they can appear accordingly. However please note that the admin interface (the back-end) cannot be translated and is available in English only. It is easy to use though, and an author could learn to use it even without English skills.