You can change any of the words or phrases shown in our cart by clicking on the Manage languages link on the Settings page or from the Customize view of your online store editor.
From here, you'll also be able to set up translated versions of any of these phrases in the language of your choice.
For translating product titles, because these are powered by the Shopify engine and are not accessible to our app, you'll want to use a translation app such as Weglot.