[TASK] Render extension icons in Language module directly

Just like in the Extension Manager the icons for the extensions
can be rendered directly to increase speed. CSS takes care of scaling.

Change-Id: I1d6dc13d2b52c35be546af0ecaaae75960f2089e
Resolves: #53771
Releases: 6.2
Reviewed-on: https://review.typo3.org/25516
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Markus Klein
Tested-by: Markus Klein