Merge branch 'feature/ISTWCMS-5191-ebremner-image-gallery-alt' into '3.0.x'

ISTWCMS-5191: fixing alt on image galleries

See merge request !111

source/_patterns/04-components/image-gallery/image-gallery.twig

@@ -12,7 +12,7 @@
               {% include '@components/responsive-image/responsive-image.twig' with {
                 'sources': image.image.sources,
                 'img_element': image.image.img_element['#uri'],
-                'alt': 'some alt'
+                'alt': image.image.alt
               } %}
             </div>
             {% if image.caption %}