In Configuration > Leganto > UI > Branding > Logo Upoad > 'Load Leganto header logo' you can upload the logo that's gonna be displayed in the Leganto header.
But only 1 logo can be uploaded.

For institutions with different logos for different languages this is rather unfortunate

Our guess is that having more than 1 logo is not an envisaged use-case (and probably a rare one, too).

Still we would really like the ability to upload multiple logos to fit all UI languages in use.