src/app: use dcterms.issued and dcterms.publisher

I can't figure out how to theme the ItemListPreviewComponent comp-
onent even though it should be possible, so I will just fix these
in the main src app.

src/app/shared/object-list/my-dspace-result-list-element/item-list-preview/item-list-preview.component.html

@@ -13,10 +13,10 @@ <h3 [innerHTML]="dsoTitle" [ngClass]="{'lead': true,'text-muted': !item.firstMet
         <div>
           <span class="text-muted">
             <ds-truncatable-part [id]="item.id" [minLines]="1">
-              (<span *ngIf="item.hasMetadata('dc.publisher')" class="item-list-publisher"
-                [innerHTML]="item.firstMetadataValue('dc.publisher') + ', '"></span>
+              (<span *ngIf="item.hasMetadata('dcterms.publisher')" class="item-list-publisher"
+                [innerHTML]="item.firstMetadataValue('dcterms.publisher') + ', '"></span>
               <span class="item-list-date"
-                [innerHTML]="item.firstMetadataValue('dc.date.issued') || ('mydspace.results.no-date' | translate)"></span>)
+                [innerHTML]="item.firstMetadataValue('dcterms.issued') || ('mydspace.results.no-date' | translate)"></span>)
               <span *ngIf="item.hasMetadata(['dc.contributor.author', 'dc.creator', 'dc.contributor.*']);"
                 class="item-list-authors">
                 <span