Customisation of field group headings shown on WooCommerce checkout pages
Support two levels of customisation of the field group headings on the checkout page.
The first is through a filter, allowing a plugin or theme to register a hook function that can alter the string before it is displayed. The new filter is called 'wc4bp_custom_checkout_field_group_heading'.
The second is through WordPress' built-in i18n functionality (i.e. the __ function). This is achieved using a default hook function for the 'wc4bp_custom_checkout_field_group_heading' filter.
The translated string is used as the format for sprintf, so that the structure of the heading text can be changed via a translation file.
You can use a plugin like loco translate to change your language files form within the WordPress admin.