Better prompts for multiple choice questions, see bug 2791

lang/en_utf8/quiz.php

@@ -244,6 +244,7 @@ $string['modulenameplural'] = 'Quizzes';
 $string['moveto'] = 'Move to >>';
 $string['multianswer'] = 'Embedded Answers (Cloze)';
 $string['multichoice'] = 'Multiple Choice';
+$string['multipleanswers'] = 'Choose at least one answer';
 $string['multiplier'] = 'Multiplier';
 $string['name'] = 'Name';
 $string['newattemptfail'] = 'Error: Could not start a new attempt at the quiz';
@@ -406,6 +407,7 @@ $string['shuffleanswers'] = 'Shuffle answers';
 $string['shufflequestions'] = 'Shuffle questions';
 $string['significantfigures'] = ' with $a ';
 $string['significantfiguresformat'] = 'significant figures';
+$string['singleanswer'] = 'Choose one answer';
 $string['sortalpha'] = 'Sort alphabetically';
 $string['sortage']   = 'Sort by age';
 $string['sortsubmit']   = 'Sort questions';

mod/quiz/questiontypes/multichoice/questiontype.php

@@ -270,7 +270,8 @@ class quiz_multichoice_qtype extends quiz_default_questiontype {
 
         // Print input controls and alternatives
         echo '<table align="right">';
-        $stranswer = get_string('answer', 'quiz');
+        $stranswer = ($question->options->single) ? get_string('singleanswer', 'quiz') :
+            get_string('multipleanswers', 'quiz');
         echo "<tr><td valign=\"top\">$stranswer:&nbsp;&nbsp;</td><td>";
         echo '<table>';