MDL-76849 qtype_ddwtos: Include question number in answer fields

* Plus include the item number so users will have an idea which blank
numbers they are currently on.

question/type/ddwtos/lang/en/qtype_ddwtos.php

@@ -25,6 +25,7 @@
 $string['addmorechoiceblanks'] = 'Blanks for {no} more choices';
 $string['answer'] = 'Answer';
 $string['blank'] = 'blank';
+$string['blanknumber'] = 'Blank {$a}';
 $string['correctansweris'] = 'The correct answer is: {$a}';
 $string['errorlimitedchoice'] = 'Choice [[{$a}]] has been used more than once without being set to "Unlimited". Please recheck this question.';
 $string['infinite'] = 'Unlimited';

question/type/ddwtos/renderer.php

@@ -76,8 +76,8 @@ class qtype_ddwtos_renderer extends qtype_elements_embedded_in_question_text_ren
             question_display_options $options) {
         $question = $qa->get_question();
         $group = $question->places[$place];
-        $boxcontents = ' ' . html_writer::tag('span',
-                get_string('blank', 'qtype_ddwtos'), array('class' => 'accesshide'));
+        $label = $options->add_question_identifier_to_label(get_string('blanknumber', 'qtype_ddwtos', $place));
+        $boxcontents = ' ' . html_writer::tag('span', $label, array('class' => 'accesshide'));
 
         $value = $qa->get_last_qt_var($question->field($place));