feat: Improved viewers popover (#2106)

* refactoring popover

* feat: DocumentViews popover

* i18n

* fix: tab focus warnings

* test: Add tests around users.info changes

* snapshots

app/components/Popover.js

@@ -0,0 +1,34 @@
+// @flow
+import * as React from "react";
+import { Popover as ReakitPopover } from "reakit/Popover";
+import styled from "styled-components";
+import { fadeAndScaleIn } from "shared/styles/animations";
+
+type Props = {
+  children: React.Node,
+  width?: number,
+};
+
+function Popover({ children, width = 380, ...rest }: Props) {
+  return (
+    <ReakitPopover {...rest}>
+      <Contents width={width}>{children}</Contents>
+    </ReakitPopover>
+  );
+}
+
+const Contents = styled.div`
+  animation: ${fadeAndScaleIn} 200ms ease;
+  transform-origin: 75% 0;
+  background: ${(props) => props.theme.menuBackground};
+  border-radius: 6px;
+  padding: 12px 24px;
+  max-height: 50vh;
+  overflow-y: scroll;
+  width: ${(props) => props.width}px;
+  box-shadow: ${(props) => props.theme.menuShadow};
+  border: ${(props) =>
+    props.theme.menuBorder ? `1px solid ${props.theme.menuBorder}` : "none"};
+`;
+
+export default Popover;