Index: roundcubemail/program/localization/en_GB/labels.inc
===================================================================
--- roundcubemail/program/localization/en_GB/labels.inc	(revision 2308)
+++ roundcubemail/program/localization/en_GB/labels.inc	(working copy)
@@ -45,6 +45,7 @@
 $labels['reply-to'] = 'Reply-To';
 $labels['mailboxlist'] = 'Folders';
 $labels['messagesfromto'] = 'Messages $from to $to of $count';
+$labels['threadsfromto'] = 'Threads $from to $to of $count';
 $labels['messagenrof'] = 'Message $nr of $count';
 $labels['moveto'] = 'Move to...';
 $labels['download'] = 'Download';
@@ -242,6 +243,7 @@
 $labels['miscfolding'] = 'RFC 2047/2231 (MS Outlook)';
 $labels['2047folding'] = 'Full RFC 2047 (other)';
 $labels['advancedoptions'] = 'Advanced options';
+$labels['messagethreading'] = 'Show messages in threads';
 $labels['focusonnewmessage'] = 'Focus browser window on new message';
 $labels['checkallfolders'] = 'Check all folders for new messages';
 $labels['folder'] = 'Folder';
Index: roundcubemail/program/localization/en_US/labels.inc
===================================================================
--- roundcubemail/program/localization/en_US/labels.inc	(revision 2308)
+++ roundcubemail/program/localization/en_US/labels.inc	(working copy)
@@ -56,6 +56,7 @@
 
 $labels['mailboxlist'] = 'Folders';
 $labels['messagesfromto'] = 'Messages $from to $to of $count';
+$labels['threadsfromto'] = 'Threads $from to $to of $count';
 $labels['messagenrof'] = 'Message $nr of $count';
 
 $labels['moveto']   = 'Move to...';
@@ -297,6 +298,7 @@
 $labels['miscfolding'] = 'RFC 2047/2231 (MS Outlook)';
 $labels['2047folding'] = 'Full RFC 2047 (other)';
 $labels['advancedoptions'] = 'Advanced options';
+$labels['messagethreading'] = 'Show messages in threads';
 $labels['focusonnewmessage'] = 'Focus browser window on new message';
 $labels['checkallfolders'] = 'Check all folders for new messages';