Go to Settings > Main settings > Services section.
Select a service category or service, click the edit button, and go to the Languages tab.
Select the desired language and enter the translated name of the category or service.
Customers will see the name of the category or service translated into another language when they select this language in the online booking widget.
Please note that Altegio currently does not support translations for services and service categories in the Chain interface. This means that while you can add service translations in the Network interface, if you make the services and categories a Chain one, all translations will be lost.