All of Stata's interface—all menus and all dialogs—is available in Swedish.
If your computer language is set to Swedish (sv), Stata will automatically use its Swedish setting. To change languages manually using Windows or Unix, select Edit > Preferences > User-interface language... using Mac, select Stata > Preferences > User-interface language... You can also change the language using the set locale_ui command.
StataCorp gratefully acknowledges the efforts of Metrika Consulting AB, Stata's official distributor in Sweden, Finland, Norway, and Denmark, for the translation to Swedish.
Learn more about the set locale_ui command at [P] set locale_ui.