Fix reader page string (#2209)

UI/Web/src/app/book-reader/_components/book-reader/book-reader.component.html

@@ -20,7 +20,7 @@
             <ng-container *ngIf="layoutMode !== BookPageLayoutMode.Default">
               <div class="virt-pagination-cont">
                 <div class="g-0 text-center">
-                  {{t('page')}}
+                  {{t('page-label')}}
                 </div>
                 <div class="d-flex align-items-center justify-content-between text-center row g-0" *ngIf="getVirtualPage() as vp" >
                   <button class="btn btn-small btn-icon col-1" (click)="prevPage()" [title]="t('prev-page')">