Simple Commerce is developed in English. However, if you know another language, you're welcome to contribute translations to Simple Commerce.
Text within the Control Panel & any front-end validation messages can be translated.
You may read about configuring Statamic to use a language other than English over on the Statamic Documentation.
In this example, I'm using
fras an example locale. You can find a list of all possible locales here.
fr.json file in your lang orresources/lang folder (whichever folder exists).{"English Phrase": "Your Translation"}{"English Phrase": "Your Translation"}
fr.json file.resources/lang with the same filename you used in your site (example: fr.json)