fix(astro-i18n): update wrong locale code

[jsparkdev]

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The locale code pt-PR does not seem to exist.

Based on my findings, the locales pt-PT and pt-BR exist, and given that the return value of the normalizeTheLocale function is pt-pt, it is assumed that pt-PR is a typo for pt-PT, and thus it is corrected.

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[trueberryless]

Agreed, I think pt-PR was an unintended mix of BR and PT. It's not a valid BCP 47 language tag.

[ArmandPhilippot]

Indeed this was a typo, nice catch! 🙌🏽