Click on image using enter key (#1202)

* [A11y] - Switching image using the Enter key

Add the ability to switch the displayed image in the gallery by pressing the Enter key on one of the thumbnails.

* Using a const to store the value of the 'Enter' key

Using a const to store the value of the 'Enter' key

* Renaming ENTER_KEY const

* Renaming ENTER_KEY const

packages/gallery/src/components/gallery/proGallery/navigationPanel.js

@@ -4,6 +4,8 @@ import { GalleryUI } from '../../item/media/GalleryUI';
 
 import TextItem from '../../item/textItem.js';
 
+const ENTER_KEY = 'Enter';
+
 class NavigationPanel extends React.Component {
   constructor(props) {
     super(props);
@@ -97,7 +99,7 @@ class NavigationPanel extends React.Component {
                 onClick={() => this.scrollToThumbnail(idx)}
                 tabIndex={0}
                 onKeyDown={(e) => {
-                  if (e.key === 'Enter') {
+                  if (e.key === ENTER_KEY) {
                     this.scrollToThumbnail(idx);
                   }
                 }}