ISTWCMS-4695: adding alt tag to responsive images in UW service

src/Service/UWService.php

@@ -78,6 +78,9 @@ class UWService implements UWServiceInterface {
       $variables['uri'] = $file->getFileUri();
       $variables['responsive_image_style_id'] = $image_style;
 
+      // Set the alt for the image.
+      $variables['alt'] = $entity->field_media_image->alt;
+
       // These is a function from the responsive image module that sets all
       // the variables for the sources of the responsive image.
       template_preprocess_responsive_image($variables);