Changes

You can activate the languages you want to use in SETTINGS->BOOKING PAGE->INTERNATIONALISATION.  Make sure you enter descriptive texts for all languages you want to use.  The default language for your booking page is the one set in SETTINGS->BOOKING PAGE->INTERNATIONALISATION.  If you are using an embedded booking page on a multilingual web site you can embed you your booking page with a different default language for each language version adding a language parameter: