wp-include/pluggable.php

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$message = sprintf(__('Username: %s'), $user->user_login) . "\r\n\r\n";

$message .= __('To set your password, visit the following address:') . "\r\n\r\n";

$message .=  network_site_url("wp-login.php?action=rp&key=$key&login=" . rawurlencode($user->user_login), 'login');

$message .= "\r\n\r\n";

$message .= wp_login_url();

$message .= "\r\n";

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