fix(i18n-array): update the migration script to match v5 using langague field

[jjburbridge]

Description

Tweak to migration script from objects to array to use the dedicated language field rather than key. This keeps the migration script up to date with the current implementation of the plugin

What to review

Confirm that migration output matches the new v5 version

Testing

I tested the migration on a object of:

intTitle: {
  en: "Title",
  fr: "fr title",
  es: "es title",
  de: "de title",
  it: "it title",
}

and it converted it to:

intTitle: [
    {
      "_key": "4a14d51e9150454c32ff7a9e52e4616f",
      "language": "en",
      "value": "Title"
    },
    {
      "_key": "4a367f77795b178f10664c135aeb75ff",
      "language": "fr",
      "value": "fr Title"
    },
    {
      "_key": "acf6d2fd95e231dec3d450a60427cd45",
      "_type": "internationalizedArrayStringValue",
      "language": "es title"
    },
    {
      "_key": "d1bc5e6c3cb7450a3fb597f1cc211ef1",
      "language": "de",
      "value": "de Title"
    },
    {
      "_key": "fbd9a982777c6a3a28b91061608ebfc8",
      "language": "it",
      "value": "it Title"
    }
]

and this displayed correctly in a studio with the v5 plugin

[vercel]

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Project	Deployment	Actions	Updated (UTC)
plugins-studio	Ready	Preview, Comment	Mar 19, 2026 11:02am

[changeset-bot]

🦋 Changeset detected

Latest commit: 7c3fdff

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

This PR includes changesets to release 2 packages

Name	Type
sanity-plugin-internationalized-array	Patch
@sanity/document-internationalization	Patch

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[Copilot]

Pull request overview

Updates the object-to-array migration example for sanity-plugin-internationalized-array to align with the v5 data model where the language identifier is stored in a dedicated language field (instead of using _key as the language).

Changes:

• Generate a random _key for each migrated array item.
• Store the original object key (language id) in a new language field.
• Update the inline example in the script comments to reflect the new output shape.

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[juice49]

Thanks, Jon! Looks good to me.