Add strike to old header on comment (#8046)

options/locale/locale_en-US.ini

@@ -775,7 +775,7 @@ issues.self_assign_at = `self-assigned this %s`
 issues.add_assignee_at = `was assigned by <b>%s</b> %s`
 issues.remove_assignee_at = `was unassigned by <b>%s</b> %s`
 issues.remove_self_assignment = `removed their assignment %s`
-issues.change_title_at = `changed title from <b>%s</b> to <b>%s</b> %s`
+issues.change_title_at = `changed title from <b><strike>%s</strike></b> to <b>%s</b> %s`
 issues.delete_branch_at = `deleted branch <b>%s</b> %s`
 issues.open_tab = %d Open
 issues.close_tab = %d Closed