Switch to dynamic description for the data pages.

src/app/editorialisation/services/seo.service.ts

@@ -59,7 +59,7 @@ export class SeoSErvice {
     const imageUrl = (data.image != null) ?
         data.image.url : this._defaultImg;
 
-    const description = metaDescription.dataset;
+    const description = data.abstractTroncated;
 
     const meta = [
       { name: 'description', content: description },