I found this website (https://crowdin.com/project/magento-2) and the respective instructions (http://www.vanderboon.net/wiki/Install_Magento_Crowdin_Translation). Unfortunatly even after doing everything explained I don't get the translations. I also changed the localization in the configuration.
I should had that I am not using the default luma theme but one that I bought.
How can I setup a new language in magento2?