You can run applications built in App Builder concurrently in different languages.
This section describes how to translate an application built in App Builder.
"Viewing Installed Translations" in Oracle Application Express Administration Guide
21.1 About Apply Format Masks to Items
The Application Express engine applies globalization settings for each rendered page. This default behavior can impact the display of certain items such as numbers and dates.
For example, suppose your application determines the application language based on the user's browser language preference. If the Application Express engine determines the users's browser language preference is French, it displays dates and numbers in a format that conforms to French standards. You can override this default behavior and explicitly control how items display by applying a format mask. You apply a format mask by making a selection from the Display As list:
When you create the item.
After you create the item by editing the item attributes.