Translations is where you define which languages exist for your project and how they fall back when content is missing. Those languages are then available when you assign domains in Markets. Open Translations from the project sidebar (project settings).
The page header summarizes the purpose of the section. In the toolbar you will find:
Below, Published languages lists every language that is already configured.
Add language opens a dialog where you:
Confirming the dialog creates the language and refreshes the list. Success or error feedback is shown if something goes wrong.
Each language row shows:
Use the row menu to delete a language or to access export for that row when offered.
Removing a language asks for confirmation. The dialog may warn you if:
After deletion, the list updates automatically.
If domains are missing, the footer can point you to Markets to attach languages to URLs. A documentation link opens external help.
Always add languages here first, then go to Markets and assign each domain to the right language. Studio and the live storefront rely on this setup for localized content and the market/language selector when multiple options exist.