diff --git a/lang/en_utf8/quiz.php b/lang/en_utf8/quiz.php
index e62c3cc2e6e..fb83a2b39b6 100644
--- a/lang/en_utf8/quiz.php
+++ b/lang/en_utf8/quiz.php
@@ -467,12 +467,12 @@ $string['unfinished'] = 'open';
 $string['uniform'] = 'decimals, from a uniform distribution';
 $string['unit'] = 'Unit';
 $string['unknowntype'] = 'Question type not supported at line $a. The question will be ignored';
-$string['unusedcategorydeleted'] = 'This category has been deleted because, after deleting the course, their questions weren\'t used in the server anymore.';
+$string['unusedcategorydeleted'] = 'This category has been deleted because, after deleting the course, its questions weren\'t used anymore.';
 $string['unsupportedformulafunction'] = 'The function $a is not supported';
 $string['updatesettings'] = 'Update quiz settings';
 $string['upgradesure'] = '<div style=\"color: red;\">In particular the quiz module will perform an extensive change of the quiz tables and this upgrade has not yet been sufficiently tested. You are very strongly urged to backup your database tables before proceeding.</div>';
 $string['url'] = 'URL';
-$string['usedcategorymoved'] = 'This category has been moved to site level because, after deleting the course, their questions were in use by other quizzes in the server.';
+$string['usedcategorymoved'] = 'This category has been preserved and moved to the site level because it is a published category still in use by other courses.';
 $string['validate'] = 'Validate';
 $string['viewallanswers'] = 'View $a quiz attempts';
 $string['viewallreports'] = 'View reports for $a attempts';