Better wording for purge and expunge operations

CHANGELOG

@@ -1,6 +1,8 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+RELEASE 0.5-RC
+--------------
 - Plugin API: Add 'pass' argument in 'authenticate' hook (#1487134)
 - Fix attachments of type message/rfc822 are not listed on attachments list
 - Add 'login_lc' config option for case-insensitive authentication (#1487113)

program/localization/en_US/messages.inc

@@ -82,8 +82,8 @@ $messages['nospellerrors'] = 'No spelling errors found';
 $messages['folderdeleted'] = 'Folder successfully deleted';
 $messages['foldersubscribed'] = 'Folder successfully subscribed';
 $messages['folderunsubscribed'] = 'Folder successfully unsubscribed';
-$messages['folderpurged'] = 'Folder successfully purged';
-$messages['folderexpunged'] = 'Folder successfully emptied';
+$messages['folderpurged'] = 'Folder has successfully been emptied';
+$messages['folderexpunged'] = 'Folder has successfully been compacted';
 $messages['deletedsuccessfully'] = 'Successfully deleted';
 $messages['converting'] = 'Removing formatting...';
 $messages['messageopenerror'] = 'Could not load message from server';