Changing the OTHER tagline in the footer (that is, not the one that can be changed by the theming app)

I set up my own nextcloud.

When someone uses a public link to show a file, there will be two taglines in the page footer overlaying the fileview.

The first one is the line I can easily change via the theming app.
The second line says (in Swedish): Get a free account, and it links to

I have no issues with linking to

But I’d like to modify the text so that it is clear to people that the link does not refer to my organization.

I’ve searched through quite a few files but can’t seem to find the one that is relevant.

Does anyone know how to access that bit of text? Thanks!!