[TASK] Move typo3lang.js to Resources/Public/JavaScript

Move typo3/sysext/lang/res/js/be/typo3lang.js to
typo3/sysext/Resources/Public/JavaScript/Typo3Lang.js

Change-Id: I1541e377a49ac0cd3d43a222c4ca87b71268cce2
Resolves: #48655
Releases: 6.2
Reviewed-on: https://review.typo3.org/21160
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer