po: Update Brazilian Portuguese translation

Co-authored-by: Rafael Coelho Costa <coelho38r@proton.me>
Reviewed-by: Juliano de Souza Camargo <julianosc@protonmail.com>
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f