Revert "Translate table header when export course to CSV - refs BT#10293"

This reverts commit c387c13411.

main/admin/course_export.php

@@ -51,13 +51,13 @@ if (isset($_POST['formSent']) && $_POST['formSent']) {
         $archiveFile = 'export_courses_list_'.api_get_local_time();
 
         $listToExport[] = [
-            get_lang('Code'),
-            get_lang('Title'),
-            get_lang('CourseCategory'),
-            get_lang('Teacher'),
-            get_lang('Language'),
-            get_lang('Users'),
-            get_lang('OtherTeachers')
+            'Code',
+            'Title',
+            'CourseCategory',
+            'Teacher',
+            'Language',
+            'Users',
+            'OtherTeachers'
         ];
 
         $dataToExport = [];