fix(admin): update Croatian translations

[luxapan]

What

Updates the Croatian (hr) Admin translation to match recent English translation changes and improve terminology consistency.

Changes

• adds the missing translation for metadata.edit.actions.addRow
• updates the search index reindexing message to reflect that reindexing has started rather than completed
• changes Company from Firma to the more natural Croatian term Tvrtka

Testing

• ran corepack yarn i18n:validate hr.json
• validation result: ✓ hr.json is valid and matches the schema.

[changeset-bot]

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Latest commit: 7b4bc5d

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[medusa-os-bot]

Thanks for the contribution! Initial automated review looks good.

This PR updates three Croatian (hr) translation entries in the admin dashboard. The author adds the missing metadata.edit.actions.addRow key ("Dodaj red", correctly matching the English "Add row"), updates company from "Firma" to the more natural Croatian "Tvrtka", and corrects reindexSuccess to indicate that reindexing has been started rather than completed — accurately reflecting the English source text "Reindexing {{name}} started". The {{name}} placeholder is correctly preserved. All changes were validated with yarn i18n:validate hr.json which confirmed the file is valid and matches the schema. Only the translation JSON file is modified; no code changes are present. No security, performance, or correctness issues were found.

Triggered by: new PR opened