As only approved translations will be included in the downloaded files, our system auto-approves all translations unless you manually change your project settings so that a translation will only be approved if it has received a certain number of votes or is manually approved by collaborators with "reviewer" rights or higher.
To set a higher threshold,
1. Go to "Settings" inside your project page
2. Under the section "Quality Assurance", set a higher threshold for the vote number a translation has to receive before it is auto-approved.
After you have changed the settings, a translation will only be approved when it has received the vote number that you have set or is manually approved by reviewer / moderator / admin.