As you may already know, with the new Office client and Office servers (Exchange, SharePoint) products (2013 wave products), Microsoft has introduced a new of developing third party and add-ins called Apps through an App Store – in this case Office Store or SharePoint Store.
Currently, developers (and so customers) can only submit Apps in English, but by the end of this month (May 31st 2013) they will be able to provide Apps in other languages such as German, French, Spanish or Japanese.
Local App Store for these languages will be then available for customers in Summer 2013.
Enjoy