[BUGFIX] Use TYPO3.lang in DragUploader

Due to the removal of ExtJS in file list the drag uploader
throws a JS error when loading the file list.

The patch replaces the ExtJS logic with the plain array
structure introduced with TYPO3.lang.

Resolves: #66003
Releases: master
Change-Id: I069d7f3d450bc8ec33b9ee18ef4319dbf0f24d3f
Reviewed-on: http://review.typo3.org/38140


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Frans Saris <franssaris@gmail.com>
Tested-by: Frans Saris <franssaris@gmail.com>