Add default picture and factorization of title in publication edition.

frontend/src/app/core/rest-services/publications/publication.rest-service.ts

@@ -17,6 +17,10 @@ export class PublicationRestService {
     return lastValueFrom(this.httpClient.get<Publication>(`/api/publications/${publicationId}`));
   }
 
+  create(publication: Publication): Promise<void> {
+    return lastValueFrom(this.httpClient.post<void>('/api/publications', publication));
+  }
+
   update(publication: Publication): Promise<void> {
     return lastValueFrom(this.httpClient.put<void>(`/api/publications/${publication.id}`, publication));
   }