Update SLUG field in server side post_create and put_update hooks.

api/collections/content.yml

@@ -176,9 +176,9 @@ fields:
           choices:
               endpoint: "articles"
               params:
-                  sort: "article.publish_date.from"
+                  sort: "article.general.publish_date.from"
                   filter: { "article.assignments.pages": { source: "path" } }
-              template: { twig: "{{ article.content.title }}" }
+              template: { twig: "<div>{{ article.content.title }}</div><div>{{ article.general.locale }}</div>" }
     - name: tags
       type: string[]
       meta: