i18n(pt-br): update guides/i18n.mdx

[daniloraisi]

What kind of changes does this PR include?

• Changes or translations of Starlight docs site content

Description

This PR updates the Portuguese version of the guides/i18n.mdx page with changes from #742, #809, #855, #1012, #1102 & #1162.

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[Fryuni]

I think the tone and style should be kept from the original. Since the original text is in the style of a dialogue and refers to what the reader does possesively with "your ...", I think the text in Portuguese should remain as "seu/sua ..."

[daniloraisi]

Thanks for your review @Fryuni. I reviewed and changed the translation.

Please let me know of any other suggestions.