MDL-27975 community block: fixed string typo

blocks/community/lang/en/block_community.php

@@ -63,8 +63,8 @@
 Others are course templates provided for you to download and use on your own Moodle site.';
 $string['enrollable'] = 'courses I can enrol in';
 $string['enrollablecourses'] = 'Enrollable courses';
-$string['errorcourselisting'] = 'An error occured when retrieving the course listing from the selected hub, please try again later. ({$a})';
-$string['errorhublisting'] = 'An error occured when retrieving the hub listing from Moodle.org, please try again later. ({$a})';
+$string['errorcourselisting'] = 'An error occurred when retrieving the course listing from the selected hub, please try again later. ({$a})';
+$string['errorhublisting'] = 'An error occurred when retrieving the hub listing from Moodle.org, please try again later. ({$a})';
 $string['fileinfo'] = 'Language: {$a->lang} - License: {$a->license} -  Time updated: {$a->timeupdated}';
 $string['hub'] = 'hub';
 $string['hubnottrusted'] = 'Not trusted';