fix(ADA-1789): [ORS] - Firefox playerkit - "Read more" button in the …

…navigation overlay is not read by screen reader (NVDA) (#952)

Issue:
screen reader doesn't announce the "Read more" button in Firefox browser

Fix:
Adding role button to div element.

Resolves ADA-1789

src/components/expandable-text/expandable-text.tsx

@@ -25,7 +25,7 @@ interface ExpandableTextProps {
 
 const ReadMoreLessButton = ({isTextExpanded, readLessLabel, readMoreLabel, onClick, onKeyDown, ...otherProps}) => {
   return (
-    <div tabIndex={0} className={styles.moreButtonText} onClick={onClick} onKeyDown={onKeyDown} {...otherProps}>
+    <div role="button" tabIndex={0} className={styles.moreButtonText} onClick={onClick} onKeyDown={onKeyDown} {...otherProps}>
       {isTextExpanded ? readLessLabel : readMoreLabel}
     </div>
   );