add icons exercise matching drag and fix icons _na

main/exercice/MatchingDraggable.php

@@ -10,7 +10,7 @@
 class MatchingDraggable extends Question
 {
 
-    public static $typePicture = 'matching.png';
+    public static $typePicture = 'matchingdrag.png';
     static $explanationLangVar = 'MatchingDraggable';
 
     /**

main/img/icons/svg/matching.svg

@@ -14,82 +14,16 @@
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