Almost all of the labels in Booker25 are stored in Salesforce Custom Labels. This means you can easily translate Booker25 into any language that is supported by Salesforce.
Missing a label? Feel free to inform us via firstname.lastname@example.org!
How to do this is explained by Salesforce here.
Go to Setup
Search for Custom Labels
Create a new view, to show all the Booker25 custom labels as follows:
You can now click on any label and translate it accordingly:
On this page: