public function addNewLessonInput()
{
$newLessonNr = Lesson::getNewLessonNr($this->course->getId());
$this->addContentAfter('<form method="post">
<input type="hidden" name="action" value="saveNewLesson" />
<table class="table">
<tr>
<td>' . $newLessonNr . '</td>
<td><input type="text" name="nameEN" placeholder="Name EN" /></td>
<td><input type="text" name="nameDE" placeholder="Name DE" /></td>
<td><input type="text" name="points" placeholder="' . I18n::t('admin.lessonadmin.points') . '" /></td>
<td><input type="submit" class="btn btn-default" value="' . I18n::t('button.save') . '" /></td>
</tr>
</table>
</form>');
}