OO-1512: implements missing select / deselect all

src/main/java/org/olat/course/assessment/ui/ChooseElementsController.java

@@ -117,9 +117,9 @@ public class ChooseElementsController extends FormBasicController {
 	@Override
 	protected void formInnerEvent(UserRequest ureq, FormItem source, FormEvent event) {
 		if(selectAll == source) {
-			
+			selectTree.selectAll();
 		} else if(deselectAll == source) {
-			
+			selectTree.deselectAll();
 		}
 		super.formInnerEvent(ureq, source, event);
 	}

src/main/java/org/olat/course/assessment/ui/_content/choose_elements.html

 #if($elementNames && $elementNames.size() > 0)
 	$r.translate("elements"):
 	#foreach($elementName in $elementNames)
-		<span>$elementName</span>
+		<span>#if($elementNames.indexOf($elementName) > 0), #end$elementName</span>
 	#end
 	<br/>
 #end