Use aria hidden for global icons

We use them in buttons/links that already have accessible context
(title, content or label) or just as decorative icons (in menu for
example)

client/src/app/shared/shared-icons/global-icon.component.ts

@@ -106,6 +106,7 @@ export class GlobalIconComponent implements OnInit {
       'filter:internal.common.svg-icons.get-content.params',
       'filter:internal.common.svg-icons.get-content.result'
     )
+    nativeElement.ariaHidden = 'true'
 
     if (this.width) {
       nativeElement.style.width = this.width