MDL-56881 mod_choice: clarify lang string for limit-reached scenarios

mod/choice/lang/en/choice.php

@@ -51,7 +51,7 @@
 $string['choiceclose'] = 'Allow responses until';
 $string['choice:deleteresponses'] = 'Modify and delete responses';
 $string['choice:downloadresponses'] = 'Download responses';
-$string['choicefull'] = 'This choice is full and there are no available places.';
+$string['choicefull'] = 'One or more of the options you have selected have already been filled. Your response has not been saved. Please make another selection.';
 $string['choice:choose'] = 'Record a choice';
 $string['choicecloseson'] = 'Choice closes on {$a}';
 $string['choicename'] = 'Choice name';