[TASK] Style "Download" button - element information

Brings button style to "Download" link with download icon.

Change-Id: I4edae8b861d9c6f98f156d8b538031dd8ca8f62c
Resolves: #55597
Releases: 6.2
Reviewed-on: https://review.typo3.org/27267
Reviewed-by: Marcin Sągol
Tested-by: Marcin Sągol
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters

typo3/sysext/backend/Classes/Controller/ContentElement/ElementInformationController.php

@@ -283,7 +283,8 @@ class ElementInformationController {
 
 			// Display download link?
 			if ($this->fileObject->getPublicUrl()) {
-				$downloadLink .= '<a href="../' . $this->fileObject->getPublicUrl() . '" target="_blank">' .
+				$downloadLink .= '<a href="../' . $this->fileObject->getPublicUrl() . '" target="_blank" class="t3-button">' .
+						IconUtility::getSpriteIcon('actions-edit-download') . ' ' .
 						$GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_common.xlf:download', TRUE) .
 						'</a>';
 			}