In the new LiveHelp Server 2.3 you can disable the language combox option at the login form if you not need, also if you have one language only the option will not be visible.
To disable language option you need to follow the next steps:
1. Enter to manage domains.
2. Select the domain and click in the top button “edit Settings”.
3. Locate the tab chat.
4. Set Enable in the option “Disable language selection”.
Chat window with the language option