MDL-42338 lti_mod: convert hardcoded string.

mod/lti/grade.php

@@ -153,7 +153,7 @@ foreach ($submissions as $submission) {
 
 $table = str_replace('<!--table body-->', $rows, $html);
 
-$title = 'Submissions for ' . $lti->name;
+$title = get_string('submissionsfor', 'lti', $lti->name);
 
 $PAGE->set_title(format_string($title , true));
 $PAGE->set_heading($course->fullname);

mod/lti/lang/en/lti.php

@@ -395,6 +395,7 @@ The only case in which this option should be selected is if the tool configurati
 For example, if all launches to the tool provider just take the user to a landing page instead of to a specific resource.';
 $string['size'] = 'Size parameters';
 $string['submission'] = 'Submission';
+$string['submissionsfor'] = 'Submissions for {$a}';
 $string['toggle_debug_data'] = 'Toggle Debug Data';
 $string['tool_config_not_found'] = 'Tool configuration not found for this URL.';
 $string['tool_settings'] = 'Tool Settings';