Fix exercise double icons.

main/exercice/question_admin.inc.php

@@ -23,11 +23,11 @@ if (is_object($objQuestion)) {
 	$form = new FormValidator('question_admin_form','post', $action);
 	if (isset($_GET['editQuestion'])) {
 		$class = "btn btn-default";
-		$text='<i class="fa fa-check"></i> '.get_lang('ModifyQuestion');
+		$text = get_lang('ModifyQuestion');
 		$type = isset($_GET['type']) ? Security::remove_XSS($_GET['type']) : null;
 	} else {
 		$class = "btn btn-default";
-		$text='<i class="fa fa-plus"></i> '.get_lang('AddQuestionToExercise');
+		$text = get_lang('AddQuestionToExercise');
 		$type = $_REQUEST['answerType'];
 	}