Translations will be downloaded according to the rules, set in the Project Settings, Export section.
In case, you have built your project recently, and there weren’t any important activities since that time, go to the Translations tab, and click Download Latest.
By default, downloaded ZIP archive will contain separate folders per each language. These folders will be named with codes correspondent to each language (Language Codes).
Use export patterns to change the structure of ZIP archive according to your needs.