Move feedback activity type name to comment artefact plugin

Signed-off-by: Richard Mansfield <richardm@catalyst.net.nz>

htdocs/artefact/comment/lang/en.utf8/artefact.comment.php

@@ -59,5 +59,6 @@ $string['makeprivate'] = 'Change to Private';
 $string['makepublic'] = 'Make public';
 $string['thisfeedbackispublic'] = 'This feedback is public';
 $string['thisfeedbackisprivate'] = 'This feedback is private';
+$string['typefeedback'] = 'Feedback';
 
 ?>

htdocs/lang/en.utf8/activity.php

@@ -29,7 +29,6 @@ defined('INTERNAL') || die();
 
 $string['typemaharamessage'] = 'System message';
 $string['typeusermessage'] = 'Message from other users';
-$string['typefeedback'] = 'Feedback';
 $string['typewatchlist'] = 'Watchlist';
 $string['typeviewaccess'] = 'New view access';
 $string['typecontactus'] = 'Contact us';