Store supported languages and default language
Key Takeaway
A language shows up as Available for a store's Supported Languages only after it's added and marked Active in Translation Workbench. Buyers see the store in their user record's language if the store supports it, or in the store's default language if it doesn't.
A B2B Commerce store can show its pages in more than one language. Each store has a list of supported languages, which are the languages it can show to buyers. Each store also has one default language, which is the fallback for any buyer whose language the store doesn't support. You set up languages in three places: Translation Workbench, the store's settings and Experience Builder.
Which language a buyer sees
The language a buyer sees comes from the language set in their user record.
If the language in the buyer's user record is one of the store's supported languages...
The buyer sees the store in that language.
If the language in the buyer's user record is not one of the store's supported languages...
The buyer sees the store in its default language.
A buyer can change their own language in the customizable user settings component. If they pick a language that the store doesn't support, they still see the store in its default language.
Supported languages alone don't give buyers a language picker, because the language comes from the user record. To let buyers select a language for the store, use the markets feature to segment the store by locale.
A store supports English and German. The store's default language is English. Priya's user record is set to German, so she sees the store in German. Marco's user record is set to Italian. Italian isn't one of this store's supported languages, so Marco sees the store in English, the default language.