<?php
include 'wp-load.php';
include 'locales.php'; // http://glotpress.trac.wordpress.org/browser/trunk/locales/locales.php

$gp_locales = new GP_Locales;

echo '<pre>';

foreach ( $gp_locales->locales as $locale ) {
    if ( ! $locale->wp_locale )
        continue;

    $response = wp_remote_get( "http://api.wordpress.org/core/credits/1.1/?version=3.8&locale={$locale->wp_locale}" );

    if ( is_wp_error( $response ) || 200 != wp_remote_retrieve_response_code( $response ) )
        continue;

    $results = json_decode( wp_remote_retrieve_body( $response ), true );

    if ( ! is_array( $results ) || empty( $results['groups']['validators'] ) )
        continue;

    $number = count( $results['groups']['validators']['data'] );
    $usernames = array_keys( $results['groups']['validators']['data'] );

    printf( '%s: %s (%s)<br />', $locale->wp_locale, $number, implode( ', ', $usernames ) );
}

echo '</pre>';