Korean translations

[tylerryu-oai]

This PR includes the following:

• Korean translations config + translation prompts

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Latest commit: a91300d

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[seratch]

@tylerryu-oai Can you update https://github.com/openai/openai-agents-js/blob/main/docs/astro.config.mjs as well? You can do the same with this PR: https://github.com/openai/openai-agents-js/pull/493/files