diff --git a/classes/form/evaluserexportform.php b/classes/form/evaluserexportform.php
index c4557cb52a14a9ffb4169b677aa68bdb61e57364..668918e3427e04bd27939b295caf98bfec88c190 100644
--- a/classes/form/evaluserexportform.php
+++ b/classes/form/evaluserexportform.php
@@ -34,8 +34,7 @@ require_once($CFG->libdir.'/formslib.php');
 
 class evaluserexportform extends moodleform {
 
-    public function definition()
-    {
+    public function definition() {
         $mform = $this->_form;
 
         $courseid = $this->_customdata['courseid'];
@@ -52,20 +51,22 @@ class evaluserexportform extends moodleform {
         $mform->setType('coursecontext', PARAM_INT);
         $mform->setConstant('coursecontext', $coursecontext->id);
 
-        $placeholder = get_string('course_code_placeholder', 'local_hshexport');
-        $mform->addElement('text', 'course_code', get_string('course_code', 'local_hshexport'), 'maxlength="150" size="50" placeholder="'.$placeholder.'"');
-        $mform->setType('course_code', PARAM_TEXT);
-        $mform->addHelpButton('course_code', 'course_code', 'local_hshexport');
-        $mform->setDefault('course_code', null);
+        $placeholder = get_string('coursecode_placeholder', 'local_hshexport');
+        $mform->addElement('text', 'coursecode', get_string('coursecode', 'local_hshexport'),
+            'maxlength="150" size="50" placeholder="'.$placeholder.'"');
+        $mform->setType('coursecode', PARAM_TEXT);
+        $mform->addHelpButton('coursecode', 'coursecode', 'local_hshexport');
+        $mform->setDefault('coursecode', null);
 
         $viewableroles = get_roles_used_in_context($coursecontext, false);
         $roles = role_fix_names($viewableroles, $coursecontext, ROLENAME_ALIAS);
-        $roles_checkboxes = [];
+        $rolescheckboxes = [];
         foreach ($roles as $role) {
-            $roles_checkboxes[] =& $mform->createElement('advcheckbox', 'role_'.$role->id, $role->localname, null, ['group' => 1], [null, $role->id]);
+            $rolescheckboxes[] =& $mform->createElement('advcheckbox', 'role_'.$role->id,
+                $role->localname, null, ['group' => 1], [null, $role->id]);
         }
 
-        $mform->addGroup($roles_checkboxes, 'roles', get_string('select_roles', 'local_hshexport'), ['<br/>'], true);
+        $mform->addGroup($rolescheckboxes, 'roles', get_string('select_roles', 'local_hshexport'), );
         $mform->addHelpButton('roles', 'select_roles', 'local_hshexport');
         $mform->addGroupRule(
             'roles',
@@ -83,4 +84,4 @@ class evaluserexportform extends moodleform {
         $submitlabel = get_string('csvdownload', 'local_hshexport');
         $this->add_action_buttons(true, $submitlabel);
     }
-}
\ No newline at end of file
+}
diff --git a/classes/local/exporter.php b/classes/local/exporter.php
index 3f7d44dbc3a53fe0f6e34f59662a3cdf18495218..4eb317f8e92532bd936e6ce4603747d0a38c9474 100644
--- a/classes/local/exporter.php
+++ b/classes/local/exporter.php
@@ -32,15 +32,15 @@ class exporter {
     const USER_DELETED = 0;
     const USER_SUSPENDED = 0;
     private int $courseid;
-    private string $course_code;
+    private string $coursecode;
     private array $roles;
     private string $filename;
     private string $content;
 
 
-        public function __construct($data) {
+    public function __construct($data) {
         $this->courseid = $this->set_courseid($data);
-        $this->course_code = $this->set_course_code($data);
+        $this->coursecode = $this->set_coursecode($data);
         $this->roles = $this->set_roles($data);
         $this->filename = $this->set_filename();
         $this->content = $this->set_content();
@@ -54,16 +54,15 @@ class exporter {
         }
     }
 
-    private function set_course_code($data) {
-        if (property_exists($data, 'course_code')) {
-            return $data->course_code;
+    private function set_coursecode($data) {
+        if (property_exists($data, 'coursecode')) {
+            return $data->coursecode;
         } else {
             return null;
         }
     }
 
-    private function set_roles($data): array
-    {
+    private function set_roles($data) {
         if (property_exists($data, 'roles')) {
             $roleids = array_filter(array_values($data->roles));
             $roles = array_map('intval', $roleids);
@@ -73,8 +72,7 @@ class exporter {
         }
     }
 
-    private function set_content(): ?string
-    {
+    private function set_content() {
         global $CFG;
         require_once($CFG->libdir . '/csvlib.class.php');
 
@@ -84,11 +82,10 @@ class exporter {
         return \csv_export_writer::print_array($rows, $delimiter, '"', true);
     }
 
-    private function set_filename(): string 
-    {
+    private function set_filename() {
 
-        // use course shortname if no course_code is given
-        $filename = $this->course_code;
+        // Use course shortname if no course code is given.
+        $filename = $this->coursecode;
         if (!$filename) {
             global $DB;
             $course = $DB->get_record('course', ['id' => $this->courseid], '*', MUST_EXIST);
@@ -100,47 +97,41 @@ class exporter {
             $filename = str_replace(',', '-', $course->shortname);
         }
 
-        // extend filename with prefix and date
+        // Extend filename with prefix and timestamp.
         $filename = $this->add_prefix($filename);
         $filename = $this->add_timestamp($filename);
         $filename = $this->add_extension($filename);
         return clean_filename($filename);
     }
 
-    private function add_prefix($name): string
-    {
+    private function add_prefix($name) {
         return 'TN_'.$name;
     }
 
-    private function add_timestamp($name): string
-    {
+    private function add_timestamp($name) {
         return $name.'_'.gmdate("Ymd_Hi");
     }
 
-    private function add_extension($name): string
-    {
+    private function add_extension($name) {
         return $name.'.csv';
     }
 
-    private function get_delimiter(): string
-    {
+    private function get_delimiter() {
         return 'semicolon';
     }
 
-    private function get_mimetype(): string
-    {
+    private function get_mimetype() {
         return 'application/download';
     }
 
-    private function get_rows(): array
-    {
+    private function get_rows() {
         $users = $this->get_users_by_role();
 
         $rows = [];
 
         foreach ($users as $user) {
-            if ($this->course_code) {
-                $row['course_code'] = $this->course_code;
+            if ($this->coursecode) {
+                $row['coursecode'] = $this->coursecode;
             }
             $row['email'] = $user->email;
             $rows[] = $row;
@@ -148,8 +139,7 @@ class exporter {
         return $rows;
     }
 
-    private function get_users_by_role():array
-    {
+    private function get_users_by_role() {
         global $DB;
 
         $context = context\course::instance($this->courseid, MUST_EXIST);
@@ -160,17 +150,17 @@ class exporter {
 
         [$inrolesql, $params] = $DB->get_in_or_equal($this->roles, SQL_PARAMS_NAMED);
 
-        $sql = "SELECT DISTINCT u.email 
-              FROM {user} u 
-              JOIN {role_assignments} ra ON u.id=ra.userid 
-              JOIN mdl_user_enrolments e ON e.userid=u.id 
-              JOIN mdl_role r ON ra.roleid=r.id 
-              JOIN mdl_context c ON ra.contextid=c.id 
+        $sql = "SELECT DISTINCT u.email
+              FROM {user} u
+              JOIN {role_assignments} ra ON u.id=ra.userid
+              JOIN mdl_user_enrolments e ON e.userid=u.id
+              JOIN mdl_role r ON ra.roleid=r.id
+              JOIN mdl_context c ON ra.contextid=c.id
              WHERE c.contextlevel= :contextlevel
-                   AND e.status = :enrolment_status
+               AND e.status = :enrolment_status
                    AND u.deleted = :user_deleted
                    AND u.suspended = :user_suspended
-                   AND instanceid = :courseid 
+                   AND instanceid = :courseid
                    AND r.id {$inrolesql}";
 
         $params['contextlevel'] = CONTEXT_COURSE;
@@ -184,12 +174,11 @@ class exporter {
         return $users;
     }
 
-    public function send_file(): void
-    {
+    public function send_file() {
         global $CFG;
         require_once($CFG->libdir.'/filelib.php');
 
         send_file($this->content, $this->filename, null, 0, true, true,
             $this->get_mimetype());
     }
-}
\ No newline at end of file
+}
diff --git a/export.php b/export.php
index 1a288b789d75160b5ee0801dc4a76269293c9d9f..5c02b15ac9fabd42bbe4800776e6ab16ae938d4a 100644
--- a/export.php
+++ b/export.php
@@ -27,7 +27,7 @@ use local_hshexport\local\exporter;
 
 require(__DIR__ . '/../../config.php');
 
-$courseid = required_param('id',PARAM_INT);
+$courseid = required_param('id', PARAM_INT);
 
 $course = $DB->get_record('course', ['id' => $courseid], '*', MUST_EXIST);
 
@@ -54,7 +54,7 @@ $formdata = $mform->get_data();
 if ($mform->is_cancelled()) {
     $returnurl = new moodle_url('/user/index.php', ['id' => $course->id]);
     redirect($returnurl);
-} elseif ($formdata) {
+} else if ($formdata) {
     $exporter = new exporter($formdata);
     $exporter->send_file();
 } else {
diff --git a/lang/de/local_hshexport.php b/lang/de/local_hshexport.php
index 2ea1503a690f1228541883697123b1dcc061b1ad..464ea5a71ad0a848e072b0e4e5c84645d8587102 100644
--- a/lang/de/local_hshexport.php
+++ b/lang/de/local_hshexport.php
@@ -25,18 +25,18 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+$string['checkall'] = 'Alle auswählen';
+$string['coursecode'] = 'LV-Kennung';
+$string['coursecode_help'] = 'Eine LV-Kennung muss eindeutig und einmalig sein, z.B. eine Modulkurzbezeichnung. Sie ist die eindeutige Kennung, unter der die Evaluation durchgeführt wird. Beispiele: BBA-422-01 oder 010-103.  Bei Fragen zu Ihrer LV Kennung wenden Sie sich bitte an Ihr Dekanatsbüro.';
+$string['coursecode_placeholder'] = 'Bitte hier LV Kennung eingeben';
+$string['csvdownload'] = 'CSV herunterladen';
+$string['evaluserexport_form_into'] = 'Nutzen Sie dieses Formular um eine CSV-Datei mit den Nutzern der ausgewählten Rollen für die Evaluation zu erzeugen.';
 $string['hshexport:canexport'] = 'Kann Nutzer für Evasys als csv exportieren';
-$string['pluginname'] = 'HSH Nutzer Export für Evaluation';
 $string['nav_course'] = 'Link in Kursnavigation';
 $string['nav_participants'] = 'Link in Auswahlbutton der Teilnehmerliste';
 $string['navigation'] = 'Platzierung des Links';
 $string['navigation_desc'] = 'Der Ort, an dem der Link für das Formular zum Export von Nutzern zur Evaluation innerhalb eines Kurses hinzugefügt wird.';
-$string['course_code_placeholder'] = 'Bitte hier LV Kennung eingeben';
-$string['course_code'] = 'LV-Kennung';
-$string['course_code_help'] = 'Eine LV-Kennung muss eindeutig und einmalig sein, z.B. eine Modulkurzbezeichnung. Sie ist die eindeutige Kennung, unter der die Evaluation durchgeführt wird. Beispiele: BBA-422-01 oder 010-103.  Bei Fragen zu Ihrer LV Kennung wenden Sie sich bitte an Ihr Dekanatsbüro.';
+$string['noselectedroles'] = 'Mindestens eine Rolle muss ausgewählt werden.';
+$string['pluginname'] = 'HSH Nutzer Export für Evaluation';
 $string['select_roles'] = 'Rollen';
 $string['select_roles_help'] = 'Nutzer mit dieser Rolle bzw. diesen Rollen exportieren.';
-$string['checkall'] = 'Alle auswählen';
-$string['csvdownload'] = 'CSV herunterladen';
-$string['noselectedroles'] = 'Mindestens eine Rolle muss ausgewählt werden.';
-$string['evaluserexport_form_into'] = 'Nutzen Sie dieses Formular um eine CSV-Datei mit den Nutzern der ausgewählten Rollen für die Evaluation zu erzeugen.';
diff --git a/lang/en/local_hshexport.php b/lang/en/local_hshexport.php
index 07ec0ae8b2b5c8097962c376bcee55cc8a7a619d..ddbfd132ec7ae5e530a8c13b1a30196030b04ddf 100644
--- a/lang/en/local_hshexport.php
+++ b/lang/en/local_hshexport.php
@@ -25,18 +25,18 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+$string['checkall'] = 'Check all';
+$string['coursecode'] = 'Course code';
+$string['coursecode_help'] = 'A course code must be unique and unambiguous, e.g. a module abbreviation. It is the unique identifier under which the evaluation is carried out. Examples BBA-422-01 or 010-103. If you have any questions concerning your course code, please contact your dean\'s office.';
+$string['coursecode_placeholder'] = 'Please enter course code here';
+$string['csvdownload'] = 'Download csv';
+$string['evaluserexport_form_into'] = 'Use this form to generate a CSV file with users of selected roles for evaluation purposes.';
 $string['hshexport:canexport'] = 'Can export user csv for  evasys';
-$string['pluginname'] = 'HSH User export';
 $string['nav_course'] = 'Navigation node in course navigation';
 $string['nav_participants'] = 'Navigation node in participants page jump menu';
 $string['navigation'] = 'Navigation node placement';
 $string['navigation_desc'] = 'The location where the navigation node for evaluation user export form will be added within a course.';
-$string['course_code_placeholder'] = 'Please enter course code here';
-$string['course_code'] = 'Course code';
-$string['course_code_help'] = 'A course code must be unique and unambiguous, e.g. a module abbreviation. It is the unique identifier under which the evaluation is carried out. Examples BBA-422-01 or 010-103. If you have any questions concerning your course code, please contact your dean\'s office.';
+$string['noselectedroles'] = 'At least one role has to be selected.';
+$string['pluginname'] = 'HSH User export';
 $string['select_roles'] = 'Roles';
 $string['select_roles_help'] = 'Export users with this role or these roles.';
-$string['checkall'] = 'Check all';
-$string['csvdownload'] = 'Download csv';
-$string['noselectedroles'] = 'At least one role has to be selected.';
-$string['evaluserexport_form_into'] = 'Use this form to generate a CSV file with users of selected roles for evaluation purposes.';
\ No newline at end of file