Shopify provides checkout and system messages in the following languages:

• English
• French
• Spanish
• German
• Japanese
• Dutch
• Danish
• Portuguese (Brazil)
• Portuguese (Portugal)

If you're producing a translation for any of the languages on this list, you don't need to include checkout and system messages in the locale file. If you submit an internationalized theme in a language that's not on this list, then your locale file must include translations for the checkout and system messages.