fix(admin-ui): Fix header for promotion list (#2782)

packages/admin-ui/src/lib/marketing/src/components/promotion-list/promotion-list.component.html

@@ -100,7 +100,7 @@
         </ng-template>
     </vdr-dt2-column>
     <vdr-dt2-column
-        [heading]="'marketing.per-customer-limit' | translate" id="per-customer-limit"
+        [heading]="'marketing.usage-limit' | translate" id="per-customer-limit"
         [sort]="sorts.get('usageLimit')"
         [hiddenByDefault]="true"
     >