Add description to context menu + Improve context menu position and size

src/Components/Menu/MenuItem.tsx

@@ -3,6 +3,7 @@ import * as React from 'react';
 interface IMenuItemProps {
   className?: string
   text: string
+  title?: string
   onClick: () => void
 }
 
@@ -10,6 +11,7 @@ export function MenuItem(props: IMenuItemProps): JSX.Element {
   return (
     <button type="button"
       className={props.className}
+      title={props.title}
       onClick={() => props.onClick()}>{props.text}
     </button>
   );