Smart campaigns are the default campaign type for new Google Ads users in every country where Google Ads is available. Learn more about country restrictions for Google Ads.
The Smart campaign interface is available in 44 languages, which can be found here.
Note: These languages are different from the ones that you can write your ads in. See the full list of languages for writing ads by clicking Edit in the 'Keyword themes' card. Here you will find a drop-down with the available ad languages.