Every translation can have its own reviewer: a native speaker you trust. Add their name, and the studio gives you a private link to send them yourself. They need no account: the link opens this translation, line by line next to your original.
- Each change they make is kept as theirs, in the line's history, and you can put any line back as it was.
- Lines you've locked are final: they can read them but not change them.
- When they're done, they sign the translation off, with a note if they like. The QA report says who reviewed it, how many lines they changed and when they signed off.
A link works for 60 days. Remove it whenever you like, and it stops working at once.