[BUGFIX] Fix double escaping of icon and title in EXT:impexp

The title and icon are double escaped. This leads to HTML output
as readable code. Move translation into the controller.

Resolves: #76277
Releases: master,7.6
Change-Id: I5529e00788ea870475d4b46f2da9dd472d226a97
Reviewed-on: https://review.typo3.org/50548


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Michael Oehlhof <typo3@oehlhof.de>
Tested-by: Michael Oehlhof <typo3@oehlhof.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>