Google AdSense supports publishers in several different languages. Applications for participation in the program can be for sites with content primarily in:
You can select your site's primary language during the application process. If you're approved, AdSense will serve relevant ads to your pages in the appropriate language, even if your site contains multiple supported languages.
Note that placing AdSense ad code on pages with content primarily in an unsupported language is not permitted by the AdSense Program policies.