Hello @samair,
Please run below command at once in magento 2 root directory
wget https://github.com/mageplaza/magento-2-portuguese-brazil-language-pack/raw/master/pt_BR.csv
rm -rf pub/static/frontend/* pub/static/adminhtml/* var/cache/ var/generation/ var/page_cache/ var/view_preprocessed/ var/composer_home generated/
php bin/magento i18n:pack -m replace pt_BR.csv pt_BR
php bin/magento setup:static-content:deploy -f pt_BR
chmod -Rf 777 pub/ var/
php bin/magento cache:clean
php bin/magento cache:flush
Now time to activate the language pack for your Magento 2 store. From Magento 2 admin panel, navigate to Stores > Configuration > General > Locale Options
https://www.screencast.com/t/X2VOD82OP
![aPSUA0l.png aPSUA0l.png](https://community.magento.com/t5/image/serverpage/image-id/10062i8E064DE204823ECC/image-size/large?v=v2&px=999)
Select Portuguese (Brazil) and click Save Configuration
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If my answer is useful, please Accept as Solution & give Kudos