Fix alt-text pop-in not using the translated description (#32766)

app/javascript/mastodon/components/media_gallery.jsx

@@ -97,12 +97,12 @@ class Item extends PureComponent {
       height = 50;
     }
 
-    if (attachment.get('description')?.length > 0) {
-      badges.push(<AltTextBadge key='alt' description={attachment.get('description')} />);
-    }
-
     const description = attachment.getIn(['translation', 'description']) || attachment.get('description');
 
+    if (description?.length > 0) {
+      badges.push(<AltTextBadge key='alt' description={description} />);
+    }
+
     if (attachment.get('type') === 'unknown') {
       return (
         <div className={classNames('media-gallery__item', { standalone, 'media-gallery__item--tall': height === 100, 'media-gallery__item--wide': width === 100 })} key={attachment.get('id')}>