Update public/js/add_content.js

public/js/add_content.js

@@ -91,7 +91,7 @@ function addcontent(item) {
       projectHTML + 
       presentationHTML + 
       repoHTML + 
-      '<img class="thumbimg" src="' + item.item.sdgImage + '" alt="SDG x Projecte Image"  style="max-width: 30%;">' +
+      '<img class="thumbimg" src="' + item.item.sdgImage + '" alt=""  style="max-width: 30%;">' +
       '</p>' +
       '</div>' +
       '</div>' +