We have replaced the static language selector on the splash pages with a new one, which can be edited dynamically so you can select which languages you would like to display to your customers. You can even hide all, making only one language available. The new option can be found in the Control Center, under Manage > Locations > Click on name > Modify Hotspot Data > Splash Page Settings.
If you are using custom skins, and edited the header files, you need to revert the header files back to original to see the change. (header.inc.html, hotspotlogin_header1.inc.html, hotspotlogin_header2.inc.html)