fix(theme-translations): add missing theme translations for pt-BR

[h3nr1ke]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

This commit adds the missing strings in the pt_BR files inside the docusaurus-theme-translation

Test Plan

1 - Build the project

yarn install
yarn build:packages && yarn start:website --locale pt-BR

2 - Access the areas affected by the translation

Algolia

EN

PT-BR

Test links

I dont have test links for this change

Related issues/PRs

Help us translate the Docusaurus 2 website #3526

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 50	🟢 98	🟢 96	🟢 100	🟠 88	Report
/docs/installation	🟠 54	🟢 96	🟢 100	🟢 100	🟠 88	Report
/docs/category/getting-started	🟠 75	🟢 100	🟢 100	🟢 90	🟠 88	Report
/blog	🟠 66	🟢 100	🟢 100	🟢 90	🟠 88	Report
/blog/preparing-your-site-for-docusaurus-v3	🟠 64	🟢 96	🟢 100	🟢 100	🟠 88	Report
/blog/tags/release	🟠 68	🟢 100	🟢 100	🟠 80	🟠 88	Report
/blog/tags	🟠 73	🟢 100	🟢 100	🟢 90	🟠 88	Report

[slorber]

Thanks 👍