Questionnaire: Inconsistent advice on 'Date' question #447472 (#397)

Co-authored-by: lamtranb <[email protected]>

Author: 2 people

lang/en/questionnaire.php

@@ -123,7 +123,7 @@
 $string['dateformatting'] = 'Use the year-month-day format, e.g. for March 4th, 1945:&nbsp; <strong>1945-03-04</strong>';
 // Prior to release 3.6.0, you could specify an input date format in the above string. Now, the format must be as below. This
 // string is used now in case sites modified the above string.
-$string['strictdateformatting'] = 'Enter the date using the date picker below, or by using the \'YYYY-MM-DD\' format.';
+$string['strictdateformatting'] = 'Enter the date using the date picker below.';
 $string['deleteallresponses'] = 'Delete ALL Responses';
 $string['deletecurrentquestion'] = 'Delete question {$a}';
 $string['deletedallgroupresp'] = 'Deleted ALL Responses in group {$a}';