[BUGFIX] Page module title obeys language overlay

Makes the page backend module's headline language overlay aware.

The displayed headline is the page title of the selected page.
But the displayed headline should also consider the selected language.

Change-Id: Ie8b3b81139b9618ac5d2331dc86be5e5cad613d5
Resolves: #39106
Releases: 6.1
Reviewed-on: https://review.typo3.org/13598
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring
Reviewed-by: Pascal Dürsteler
Tested-by: Pascal Dürsteler
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn