[pt] Localize content/en/docs/languages/java/_index.md and getting-started.md

[vitorvasc]

What needs to be changed?

As the refactor on Java docs were published recently, we must localize the Java docs on portuguese docs.

What is the name + path of the page that needs changed?

• content/en/docs/languages/java/_index.md
• content/en/docs/languages/java/getting-started.md

Additional context:

• Restructure Language SDK & API documentation information architecture #4853
• Refactor java SDK and configuration #4966

[Vinaum8]

@vitorvasc estou puxando a tradução dessa página na PR: #6393