MOBILE-3748 a11y: Indicate non-downloadable items

scripts/langindex.json

@@ -2206,6 +2206,7 @@
   "core.noselection": "form",
   "core.notapplicable": "local_moodlemobileapp",
   "core.notavailable": "moodle",
+  "core.notdownloadable": "local_moodlemobileapp",
   "core.notenrolledprofile": "moodle",
   "core.notice": "moodle",
   "core.notingroup": "moodle",

src/addons/storagemanager/pages/course-storage/course-storage.html

@@ -136,6 +136,9 @@
                                             [attr.aria-label]="'addon.storagemanager.deletedatafrom' | translate: { name: module.name }">
                                         </ion-icon>
                                     </ion-button>
+                                    <p *ngIf="!downloadEnabled || !module.handlerData?.showDownloadButton" class="sr-only">
+                                        {{ 'core.notdownloadable' | translate }}
+                                    </p>
                                 </div>
                             </ion-item>
                         </ng-container>

src/core/lang.json

@@ -220,6 +220,7 @@
     "noselection": "No selection",
     "notapplicable": "n/a",
     "notavailable": "Not available",
+    "notdownloadable": "Not downloadable",
     "notenrolledprofile": "This profile is not available because this user is not enrolled in this course.",
     "notice": "Notice",
     "notingroup": "Sorry, but you need to be part of a group to see this page.",