diff -urN ../roundcube-thunderbird_labels-1.3.0.orig/thunderbird_labels.php ./thunderbird_labels.php
--- ../roundcube-thunderbird_labels-1.3.0.orig/thunderbird_labels.php	2018-12-03 17:38:09.352014000 +0200
+++ ./thunderbird_labels.php	2018-12-03 19:49:53.373624000 +0200
@@ -49,11 +49,11 @@
 			$this->name = get_class($this);
 			# -- additional TB flags
 			$this->add_tb_flags = array(
-				/*'LABEL1' => '$Label1',
+				'LABEL1' => '$Label1',
 				'LABEL2' => '$Label2',
 				'LABEL3' => '$Label3',
 				'LABEL4' => '$Label4',
-				'LABEL5' => '$Label5',*/
+				'LABEL5' => '$Label5',
 			);
 			$this->message_tb_labels = array();