Sync language files (#3468)

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- Add csv_import_invalid_location to Items.php for CSV import validation
- Add error_deleting_admin and error_updating_admin to Employees.php for admin protection messages

Strings added with empty values so they fallback to English and show as untranslated in Weblate.

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500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f