MDL-46035 mod_survey: a string change to make an error message always…

… correct

mod/survey/lang/en/survey.php

@@ -200,7 +200,7 @@
 $string['eventreportdownloaded'] = 'Survey report downloaded';
 $string['eventreportviewed'] = 'Survey report viewed';
 $string['eventresponsesubmitted'] = 'Survey response submitted';
-$string['guestsnotallowed'] = 'Guests are not allowed to submit surveys';
+$string['guestsnotallowed'] = 'Only enrolled users are able to submit surveys';
 $string['howlong'] = 'How long did this survey take you to complete?';
 $string['howlongoptions'] = 'under 1 min,1-2 min,2-3 min,3-4 min,4-5-min,5-10 min,more than 10';
 $string['ifoundthat'] = 'I found that';