MDL-9758, add 4 new string for database tags, see tracker.

lang/en_utf8/data.php

@@ -41,6 +41,8 @@
 $string['csvfile'] = 'CSV file';
 $string['csvimport'] = 'CSV file import';
 $string['data:approve'] = 'Approve unapproved entries';
+$string['data:added'] = '<b>Added date</b>: ';
+$string['data:modified'] = '<b>Modified date</b>: ';
 $string['data:comment'] = 'Write comments';
 $string['data:managecomments'] = 'Manage comments';
 $string['data:manageentries'] = 'Manage entries';
@@ -223,6 +225,8 @@
 $string['templatesaved'] = 'Template saved';
 $string['text'] = 'Text';
 $string['textarea'] = 'Textarea';
+$string['timeadded'] = 'Added Time';
+$string['timemodified'] = 'Modified Time';
 $string['todatabase'] = 'to this database.';
 $string['type'] = 'Field type';
 $string['undefinedprocessactionmethod'] = 'No action method defined in Data_Preset to handle action \"$a\".';