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/app.component.html

@@ -17,11 +17,11 @@
                         </mat-menu>
                         <button [matMenuTriggerFor]="menuSettings" mat-icon-button><mat-icon>more_vert</mat-icon></button>
                         <mat-menu #menuSettings="matMenu">
-                            <button class="top-menu-button" (click)="openProfileDialog()" *ngIf="postsService.isLoggedIn" mat-menu-item>
+                            <button class="top-menu-button" (click)="openProfileDialog()" mat-menu-item>
                                 <mat-icon>person</mat-icon>
                                 <span i18n="Profile menu label">Profile</span>
                             </button>
-                            <button class="top-menu-button" (click)="openArchivesDialog()" mat-menu-item>
+                            <button *ngIf="!postsService.config?.Advanced.multi_user_mode || postsService.isLoggedIn" class="top-menu-button" (click)="openArchivesDialog()" mat-menu-item>
                                 <mat-icon>topic</mat-icon>
                                 <span i18n="Archives menu label">Archives</span>
                             </button>