fix(theme-translations): Add missing Portoguese (pt-PT) theme translations

[mansil]

Finished translation to pt-PT

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⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	Report
/	🟠 67	🟢 98	🟢 100	🟢 100	Report
/docs/installation	🟠 50	🟢 97	🟢 100	🟢 100	Report
/docs/category/getting-started	🟠 73	🟢 100	🟢 100	🟠 86	Report
/blog	🟠 61	🟢 96	🟢 100	🟠 86	Report
/blog/preparing-your-site-for-docusaurus-v3	🔴 45	🟢 92	🟢 100	🟢 100	Report
/blog/tags/release	🟠 61	🟢 96	🟢 100	🟠 86	Report
/blog/tags	🟠 73	🟢 100	🟢 100	🟠 86	Report

[marcelocell]

Hello, @mansil !

Here is the link to sign the CLA: https://code.facebook.com/cla

[slorber]

Closing in favor of https://github.com/facebook/docusaurus/pull/11315 because the CLA hasn't been signed.

Feel free to open a new PR and sign the CLA if you think some of your translations are better