MDL-45127 mod_lesson: Updated question edit screen with more help text.

Unless the custom scores is selected in the lesson settings the score section
in the question settings will be disabled. A help link has been added with
a description similar to this one.

mod/lesson/lang/en/lesson.php

@@ -380,6 +380,7 @@
 $string['savechangesandeol'] = 'Save all changes and go to the end of the lesson.';
 $string['savepage'] = 'Save page';
 $string['score'] = 'Score';
+$string['score_help'] = 'Score is only used when custom scoring is enabled. Each answer can then be given a numerical point value (positive or negative).';
 $string['scores'] = 'Scores';
 $string['secondpluswrong'] = 'Not quite.  Would you like to try again?';
 $string['selectaqtype'] = 'Select a question type';

mod/lesson/locallib.php

@@ -771,6 +771,12 @@ protected final function add_score($name, $label=null, $value=null) {
         if ($value !== null) {
             $this->_form->setDefault($name, $value);
         }
+        $this->_form->addHelpButton($name, 'score', 'lesson');
+
+        // Score is only used for custom scoring. Disable the element when not in use to stop some confusion.
+        if (!$this->_customdata['lesson']->custom) {
+            $this->_form->freeze($name);
+        }
     }
 
     /**