lang/repository upgraded description for repositoryallowexternallinks

lang/en_utf8/repository.php

@@ -6,7 +6,7 @@
 $string['addplugin'] = 'Add a repository plugin';
 $string['activaterep'] = 'Active repositories';
 $string['allowexternallinks'] = 'Allow external links';
-$string['configallowexternallinks'] = 'Disable using external links in repository';
+$string['configallowexternallinks'] = 'This option enables all users to choose whether or not external media is copied into Moodle or not. If this is off then media is always copied into Moodle (this is usually best for overall data integrity and security).  If this is on then users can choose each time they add media to a text.';
 $string['areabackup'] = 'Backups';
 $string['areacategoryintro'] = 'Category introduction';
 $string['areacourseintro'] = 'Course introduction';