You can add different versions of your logo depending on the preffered language of your users. These settings apply on your website as well as on invoices and communications sent from Yapla.
Go in Account configuration > Your organization > Logo. There, you will be able to upload your logo.
To add a different version in another language, select the desired language using the language selector located at the bottom left of your screen.
To ensure a coherent visual identity on your account, make sure that both logos are the exact same size
The authorized formats are : JPG and PNG. With a maximum size of 5 MB.
Note: If you do not have access to all the desired languages , take a look a the following article: how to manage your language.