MDL-62444 mod_assignment: Fix missing lang string.

mod/assignment/lang/en/assignment.php

@@ -54,7 +54,7 @@
 $string['privacy:metadata:assignment_submissions:timemodified'] = 'The modification date/time of the assignment submission.';
 $string['privacy:metadata:assignment_submissions:numfiles'] = 'The maximum number of files allowed for the assignment submission.';
 $string['privacy:metadata:assignment_submissions:data1'] = 'The onlinetext submitted for the assignment submission.';
-$string['privacy:metadata:assignment_submissions:data2'] = '';
+$string['privacy:metadata:assignment_submissions:data2'] = 'The tracked status for the assignment submission.';
 $string['privacy:metadata:assignment_submissions:grade'] = 'The grade value awarded for the assignment submission.';
 $string['privacy:metadata:assignment_submissions:submissioncomment'] = 'The submission comment accompanying the assignment submission.';
 $string['privacy:metadata:assignment_submissions:teacher'] = 'The teacher user ID grading the assignment submission.';