[Tails-l10n] transifex policy

Hello, we are writing some doc for new pt-br translation contributors and we
have doubts about transifex translation.

1. Is there a clear policy on how to become a translator using transifex? The
tails website points to the transifex website but does not say how one
becomes a translator/reviewer.

2. Is there a preference between transifex versus git pull requests
translation?

3. What is the relation between the strings in transifex and the strings in
the tails git repository?

That's it for now, we'll probably have more in the near future. ;)

thanks,
drebs.

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