UI updates (#922)

* Fixed download spinner in player component

* Downloads UI is more mobile friendly (#905)

* Code cleanup

* Fixed size of actions in home screen downloads

* Errored downloads now display their stage as "Error" in the UI

* Moved personal settings from about dialog to profile dialog

* Profile dialog can now be opened without logging in/without multi-user mode

* Fixed issue where archive dialog could be accessed from anywhere

* Misc internationalization improvements

* Combined download stage and download progress columns

* Added back loading spinner to download actions

* Adjusted thresholds for consolidating download action buttons

* Implemented virtual scrolling for notifications (helps if many notifications exist)

* Fixed minor console error

src/app/components/notifications/notifications.component.html

@@ -4,7 +4,7 @@
         <mat-chip-listbox [value]="selectedFilters" [multiple]="true" (change)="selectedFiltersChanged($event)">
             <mat-chip-option *ngFor="let filter of notificationFilters | keyvalue: originalOrder" [value]="filter.key" [selected]="selectedFilters.includes(filter.key)" color="accent">{{filter.value.label}}</mat-chip-option>
         </mat-chip-listbox>
-        <app-notifications-list (notificationAction)="notificationAction($event)" (deleteNotification)="deleteNotification($event)" [notifications]="filtered_notifications"></app-notifications-list>
+        <app-notifications-list class="notifications-list" [style.height]="list_height" (notificationAction)="notificationAction($event)" (deleteNotification)="deleteNotification($event)" [notifications]="filtered_notifications"></app-notifications-list>
     </div>
     <button style="margin: 10px 0px 2px 10px;" *ngIf="notifications?.length > 0" color="warn" (click)="deleteAllNotifications()" mat-stroked-button>Remove all</button>
 </div>