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-list/notifications-list.component.scss

@@ -13,12 +13,21 @@
     font-size: 14px;
 }
 
+.notification-card-parent {
+    margin: 5px;
+}
+
 .notification-card {
     margin-top: 5px;
 }
 
+.notification-actions {
+    margin-top: auto;
+}
+
 .card-radius {
     border-radius: 12px;
+    height: 166px;
 }
 
 .dot {
@@ -30,4 +39,8 @@
     position: absolute;
     right: 8px;
     top: 8px;
-  }
+}
+
+.viewport {
+    height: 100%;
+}