The language must be set on the mobile / PC / Mac. For Android: Settings / General Administration / Language and Input / Physical Keyboard. You can set practically all languages (incl. Russian, Thai, etc. - but I have not tried them out). You can also install several languages and then switch them on the keyboard - somehow with CMD / space bar or something similar. You have to search / try it out yourself.
The keyboard comes with a Swiss layout. The picture is wrong. After connecting, you have to change the physical keyboard from German to Swiss German in the system settings. Sounds a bit strange.