MDL-9005 Fixed this and another multilang issue (module name in preview didn't filter multilang tags either).

question/preview.php

@@ -187,7 +187,7 @@
 
     if (!empty($quizid)) {
         echo '<p class="quemodname">'.get_string('modulename', 'quiz') . ': ';
-        p($quiz->name);
+        p(format_string($quiz->name));
         echo "</p>\n";
     }
     $number = 1;

question/type/match/questiontype.php

@@ -166,7 +166,7 @@ class question_match_qtype extends default_questiontype {
             // answers per question, each with different marks and feedback.
             $answer = new stdClass();
             $answer->id       = $subquestion->code;
-            $answer->answer   = $subquestion->answertext;
+            $answer->answer   = format_string($subquestion->answertext);
             $answer->fraction = 1.0;
             $state->options->subquestions[$key]->options
              ->answers[$subquestion->code] = clone($answer);