Over the button [Shopdata] you reach the window with the extensive attitudes, which the appearance of your Shop determine:

Here you can select the language of yours shop.
Select here a language as default .
To each desired field the term (text) can be adapted. The adjusted texts are stored in the project file..
The changed texts you can save into a separate text file (in order to load it later again). Besides you can send this file also to the developer (so you will be able to integrated further languages into the default )
The before saved text file can be loaded hereby again.