The ability to show your international guests the online booking system in 'their language' is enabled by un-checking the feature "Do not use Multilingual Engine ". Go to
Booking Engine Settings to enable this setting.
By default, the multi lingual feature defaults to U.S. English.
The supported languages include Spanish, Italian, French, and German, but new languages are being added all the time.
If the multi lingual engine is on, the system uses a Geoip lookup to try to work out the country the browser is coming from. It then looks up the Country to determine the default language for that country.
We also use this Geoip lookup to get a default time zone for the Country, which helps with an issue, for example, where it is "tomorrow in Australia" when it is 'today' where the servers reside in North America.