Filter emails for multiple languages

/**
 * Email locale settings function.
 *
 * This returns an array of locales to be used
 * by the action and filter functions for this
 * customization.  The default locale should be
 * whatever the site's default language locale
 * actually is.  Then set any locales for 
 * necessary additional languages.
 *
 * For a complete list of WordPress locales, see:
 * https://wpastra.com/docs/complete-list-wordpress-locale-codes/
 */ 
function my_wpmem_email_locales() {
    return array(
        
        'default' => 'en_US',
        
        'de_DE' => 'German', 
        'es_ES' => 'Spanish',
    );
}


add_action( 'wpmem_after_admin_init', 'my_add_custom_wpmem_email' );
/**
 * This function adds custom email messages for each additional 
 * language (locale). 
 *
 * While editing anything here isn't necessary, you may want 
 * to customize the text used in the custom email headings 
 * for the admin panel. That is noted in the code comments below.
 *
 * @uses wpmem_add_custom_email()
 * @see  https://rocketgeek.com/plugins/wp-members/docs/api-functions/wpmem_add_custom_email/
 */
function my_add_custom_wpmem_email() {
    
    // Get the settings array.
    $settings = my_wpmem_email_locales();
    
    /*
     * There isn't generally a reason to change the logic
     * in this section. However, text in the array could
     * be changed if different text is desired for the
     * custom email headings.
     */
    global $wpmem;
    if ( 1 == $wpmem->mod_reg ) {
        $email_type['newmod']  = __( 'Registration is Moderated', 'wp-members' );
        $email_type['appmod']  = __( 'Registration is Moderated, User is Approved', 'wp-members' );
    } else {
        $email_type['newreg']  = __( 'New Registration', 'wp-members' );
    }
    $email_type['repass']  = __( 'Password Reset', 'wp-members' );
    $email_type['getuser'] = __( 'Forgot Username', 'wp-members' );
    
    // If using the PayPal extension renewal reminder, uncomment the line below by removing "//"
    // $email_type['wpmem_exp_reminder'] = __( 'Subscription Renewal Reminder', 'wp-members' );
    
    // Remove the default locale from the array.
    unset( $settings['default'] );
    
    foreach ( $settings as $locale => $language ) {
        
        foreach ( $email_type as $tag => $email ) {
            // Create a custom email for each locale.
            $tag = 'localized_' . $tag . '_email_' . $locale;
            $heading = 'Custom email for ' . $email . ' [' . $language . ']';
            $subject_input = 'localized_' . $tag . '_email_subj_' . $locale;
            $message_input = 'localized_' . $tag . '_email_body_' . $locale;

            // Apply the arguments to the function.
            wpmem_add_custom_email( $tag, $heading, $subject_input, $message_input );
        }
    }
}


add_filter( 'wpmem_email_filter', 'apply_my_email_translation', 10, 3 );
/**
 * This function filters the email to the user based on the 
 * current site locale (language).
 */
function apply_my_email_translation( $email, $wpmem_fields, $field_data ) {
    
    // Get the settings array.
    $settings = my_wpmem_email_locales();
    
    // Get the locale.
    $locale = get_locale();
    
    // If the current locale is not the default locale, use custom language email.
    if ( $settings['default'] != $locale || '' == $locale || ! $locale ) {
    
        $localized_email = get_option( 'localized_' . $email['tag'] . '_email_' . $locale );
        
        if ( $localized_email ) {
            // Use custom values for subject and message body.
            $email['subj']       = $localized_email['subj'];
            $email['body']       = $localized_email['body'];
            $email['add_footer'] = false;
            $email['footer']     = '';
        }
    }
    
    return $email;
}