Chore: add some missing UI accessibility labels (#13772)

src-ui/src/app/components/app-frame/toasts-dropdown/toasts-dropdown.component.html

@@ -3,7 +3,7 @@
   @if (toasts().length) {
     <span class="badge rounded-pill z-3 pe-none bg-secondary me-2 position-absolute top-0 left-0">{{ toasts().length }}</span>
   }
-  <button class="btn border-0" id="notificationsDropdown" ngbDropdownToggle>
+  <button class="btn border-0" id="notificationsDropdown" ngbDropdownToggle aria-label="Notifications" i18n-aria-label>
     <i-bs width="1.3em" height="1.3em" name="bell"></i-bs>
   </button>
   <div ngbDropdownMenu class="dropdown-menu-end shadow p-3" aria-labelledby="notificationsDropdown">