Fixed accessibility issues on BitstreamFormatsComponent

- Removed empty label of the select box and replaced it with an aria-label
- Fixed empty table header

src/app/admin/admin-registries/bitstream-formats/bitstream-formats.component.html

@@ -19,7 +19,7 @@
           <table id="formats" class="table table-striped table-hover">
             <thead>
             <tr>
-              <th scope="col" [attr.aria-label]="'admin.registries.bitstream-formats.select' | translate"></th>
+              <th scope="col"><span class="sr-only">{{'admin.registries.bitstream-formats.table.selected' | translate}}</span></th>
               <th scope="col">{{'admin.registries.bitstream-formats.table.id' | translate}}</th>
               <th scope="col">{{'admin.registries.bitstream-formats.table.name' | translate}}</th>
               <th scope="col">{{'admin.registries.bitstream-formats.table.mimetype' | translate}}</th>
@@ -35,6 +35,7 @@
                          [checked]="isSelected(bitstreamFormat) | async"
                          (change)="selectBitStreamFormat(bitstreamFormat, $event)"
                   >
+                  <span class="sr-only">{{'admin.registries.bitstream-formats.select' | translate}}}</span>
                 </label>
               </td>
               <td><a [routerLink]="['/admin/registries/bitstream-formats', bitstreamFormat.id, 'edit']">{{bitstreamFormat.id}}</a></td>

src/assets/i18n/en.json5

@@ -128,6 +128,8 @@
 
   "admin.registries.bitstream-formats.table.name": "Name",
 
+  "admin.registries.bitstream-formats.table.selected": "Selected bitstream formats",
+
   "admin.registries.bitstream-formats.table.id": "ID",
 
   "admin.registries.bitstream-formats.table.return": "Back",
@@ -142,7 +144,9 @@
 
   "admin.registries.bitstream-formats.title": "Bitstream Format Registry",
 
-  "admin.registries.bitstream-formats.select": "Select bitstream format",
+  "admin.registries.bitstream-formats.select": "Select",
+
+  "admin.registries.bitstream-formats.deselect": "Deselect",
 
   "admin.registries.metadata.breadcrumbs": "Metadata registry",