MDL-19315 Updated a string for hub publishing

lang/en/hub.php

@@ -154,7 +154,7 @@
 $string['screenshots_help'] = 'Screenshots will displayed during search results.';
 $string['search'] = 'Search';
 $string['selecthub'] = 'Select hub';
-$string['selecthubinfo'] = 'Please select the hub to publish on. A hub is a directory of Moodle sites and a directory of Moodle courses.';
+$string['selecthubinfo'] = 'A community hub is a server that lists courses. You can only publish your courses on hubs that this Moodle site is registered with.  If the hub you want is not listed below, please contact your site administrator.';
 $string['selecthubforadvertise'] = 'Select hub for advertising';
 $string['selecthubforsharing'] = 'Select hub for uploading';
 $string['sendfollowinginfo'] = 'Send the following information:';