gradeimporter/lang/en/gradeimporter.php

<?php
$string['gradeimporter'] = 'Grade Importer';

$string['modulename'] = 'Grade Importer';
$string['modulenameplural'] = 'Grade Importers';

$string['gradeimporterintro'] = 'This module facilitates...';
$string['gradeimportername'] = 'Grade Importer Name';

//formStrings

    //Generic 
    $string['description'] = 'Description';
    $string['visibility'] = 'Can students see this?';

    //Generic error Messages

    //gradeImporter form
    $string['instanceName'] = 'Name';
    $string['visibilityOn'] = 'Students can see this';
    $string['visibilityOff'] = 'Students can\'t see this';

    //gradeImporter form errors
    $string['error_instanceNameField'] = 'Insert a name';

    //submission form
    $string['submissionName'] = 'Name';
    $string['gradebookN'] = 'This submission goes to gradebook';
    $string['gradebookY'] = 'This submission does not go to gradebook';
    $string['submissionFiles'] = 'Choose the students feedback file';
    $string[''] = '';
    $string[''] = '';

    //submission form errors
    $string['error_submissionNameField'] = 'Please insert a name for this submission';