[Resolved] Translate PHP Code for redirect and custom birthdate field in woocommerce form

Hello

I have added custom PHP code for redirect in Woocommerce, so that - after payment, the customer is redirected to the correct page, as this was not given by the theme I am using.
Also, I needed to add the birthdate to the Woocommerce billing form, also using custom PHP code, and I need to transfer the word/string "Birthdate" from the form, which is not shown in the string translation.

My redirect code

add_action( 'wp_enqueue_scripts', 'emeritus_child_theme_enqueue_scripts' );
}

add_action( 'woocommerce_thankyou', 'bbloomer_redirectcustom');
function bbloomer_redirectcustom( $order_id ){
$order = wc_get_order( $order_id );
$url = 'hidden link';
if ( ! $order->has_status( 'failed' ) ) {
wp_safe_redirect( $url );
exit;
}
}

my billing form custom birthdate field code:

add_filter( 'woocommerce_billing_fields', 'display_birthdate_billing_field', 20, 1 );
function display_birthdate_billing_field($billing_fields) {

$billing_fields['billing_birthdate'] = array(
'type' => 'date',
'label' => __('Birthdate'),
'class' => array('form-row-wide'),
'priority' => 25,
'required' => true,
'clear' => true,
);
return $billing_fields;
}

add_action( 'woocommerce_checkout_update_customer', 'save_account_billing_birthdate_field', 10, 2 );
function save_account_billing_birthdate_field( $customer, $data ){
if ( isset($_POST['billing_birthdate']) && ! empty($_POST['billing_birthdate']) ) {
$customer->update_meta_data( 'billing_birthdate', sanitize_text_field($_POST['billing_birthdate']) );
}
}

add_filter('woocommerce_admin_billing_fields', 'admin_order_billing_birthdate_editable_field');
function admin_order_billing_birthdate_editable_field( $fields ) {
$fields['birthdate'] = array( 'label' => __('Birthdate', 'woocommerce') );

return $fields;
}

// WordPress User: Add Billing birthdate editable field
add_filter('woocommerce_customer_meta_fields', 'wordpress_user_account_billing_birthdate_field');
function wordpress_user_account_billing_birthdate_field( $fields ) {
$fields['billing']['fields']['billing_birthdate'] = array(
'label' => __('Birthdate', 'woocommerce'),
'description' => __('', 'woocommerce')
);
return $fields;
}

how could I achieve that?
I have 12 languages in usage, German being default lanugage of the page.

thank you