Keycloak chinese + Macs

HI,

I have activated the Chinese messages for our Chinese customer. This worked without any problems. When I open the registrypage
languages
on my Windows laptop, I can also select Chinese (see pic) . The colleagues with the Macs, however, can NOT select Chinese. No matter which browser, F5, Ctrl+F5,… nothing works. What else needs to be done on the Macs?

BR Steffen