Meanwhile we are not planning to officially release a Brazilian Portuguese language. Instead of it, within month we are planning to release SDK for Plesk, which will allow you to create custom localizations like Brazilian Portuguese yourself. The SDK will contain tools for creating and installing a language pack and the documentation describing the process of localization. We will announce when it's ready. We are also releasing a Localization Community quite soon where you will able to find all available sources for translations and share your ideas with others.