Language missing after installation

Language phrases are missing after the installation

Session is created before language pack is imported and 0 is stored as current admin language in it. We need to simply perform $this->Application->Session->SetField('Language', 1); after performing initial language pack import. Also we need to store special variable in persistent session (for root user, this is user, who is initially logged in into admin) to indicate, that 1 language should be used next time root performs login to administrative console.