Firefox's translation function, which is on-device[1], worked well for me.

You can explore the collection here[2] it seems.

[1]: https://www.mozilla.org/en-US/firefox/features/translate/

[2]: https://cep.museepicassoparis.fr/explorer/auteur/91977?field...

There is a language toggle button in the bottom right corner, but at least on my mobile device it is entirely obscured by the cookie disclosure button. And worse, the search seems entirely broken if you switch the site to English- I got no results searching eg. for everything in the "Painting" category.