fix: improve Romanian UI translations

[andreialba]

Summary

• fix a typo in the Romanian previous page label
• translate remaining English strings in packages/starlight/translations/ro.json
• add a changeset for the user-facing translation fix

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🦋 Changeset detected

Latest commit: 45e623f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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@astrojs/starlight	Patch

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