From Antergos.com front page, we can read:
“Antergos is available in many languages including Spanish, Galician, Catalan, English, German, and more.”
Portuguese is the world’s seventh most spoken language, and fifth for internet users (131.9m), hence I suggest it to be expressly mentioned in the above paragraph.
Same goes for Chinese (2nd for internet users)
Edit: from Transifex, Portuguese pt and Chinese is 100%, Portuguese br is 83% done.