fix(challenge modal): rename iframe completion button

src/components/challenge-modal/__tests__/challenge-modal.test.tsx

@@ -318,7 +318,10 @@ describe('ChallengeModal', () => {
       'https://mintpass.org',
     );
 
-    await clickButton('Close challenge');
+    const doneButton = Array.from(container.querySelectorAll('button')).find((candidate) => candidate.textContent === 'Done');
+    expect(doneButton?.getAttribute('aria-label')).toBe('Finish challenge');
+
+    await clickButton('Done');
     expect(publication.publishChallengeAnswers).toHaveBeenCalledWith(['']);
     expect(testState.removeChallengeMock).toHaveBeenCalledOnce();
   });

src/components/challenge-modal/challenge-modal.tsx

@@ -291,7 +291,9 @@ const IframeChallenge = ({
       </div>
       <div className={`${styles.challengeFooter} ${styles.iframeFooter}`}>
         <div className={styles.iframeCloseButton}>
-          <button onClick={onDone}>Close challenge</button>
+          <button aria-label='Finish challenge' onClick={onDone}>
+            Done
+          </button>
         </div>
       </div>
     </>