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/player/player.component.css

@@ -37,11 +37,15 @@
 }
 
 .spinner {
-    bottom: 1px;
-    left: 2px;
+    bottom: -2px;
+    left: 6px;
     position: absolute;
 }
 
+.buttons {
+    position: relative;
+}
+
 .save-button {
     right: 25px;
     position: fixed;
@@ -85,13 +89,6 @@
     margin-bottom: 15px;
 }
 
-.spinner-div {
-    position: relative;
-    display: inline-block;
-    margin-right: 12px;
-    top: 8px;
-}
-
 .skip-ad-button {
     position: absolute;
     right: 20px;