Fix: Updating MIgrateImportCommand to accept language for import

src/MigrateImport/ImportSpec.php

@@ -4,11 +4,22 @@ namespace Modules\Core\MigrateImport;
 
 class ImportSpec
 {
+    /**
+     * @param  ?string  $locale  The language the export file's own text
+     *   (product titles, descriptions, option names, ...) is actually
+     *   written in — asked of the operator at import time (see
+     *   Command\MigrateImportCommand), since an export has no reliable
+     *   way to declare its own language and it does not necessarily match
+     *   this store's Lunar\Models\Language::getDefault(). Null for a
+     *   source/type this doesn't apply to (e.g. an API-based import with
+     *   no free-text file to attribute a single language to).
+     */
     public function __construct(
         public readonly string $source,
         public readonly string $type,
         public readonly ?string $filePath = null,
         public readonly ?array $credentials = null,
+        public readonly ?string $locale = null,
     ) {
     }
 }