Let's allow anyone to submit the translation for review in Zanata

Can we set permissions in Zanata so that anyone can create a draft without the need to join a Language team?

Example:

It was easy for the user to create a PR in GitHub. But in Zanata, even logged in with a FAS account, users have only read-only access until they join language team, which they need to learn about. This is too much of an overhead. People would never go through that process for a one-letter fix.