I'll need to get a hold of someone to fix that particular page... the admin translation tool is no longer available as it had some serious drawbacks to usage that are incompatible with how we handle translations currently. It was very prone to duplicating text and in general we have chosen to phase it out in favor of just using the raw files as alft_f4 mentioned.
Could you point me to which pt_BR language pack you are starting with? I can update it so that it has no missing strings or duplicates and get it back to you.
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