You can provide enterprise-specific internationalization for your labels using messages.properties in your EPT project. Thus for the same UI screen, labels can differ based on which enterprise role is logged in to the system.
If you have the following entry in messages.properties file under your Bookstore module:
And you have an entry for the same label in your EPT (SampleEnterprise) messages.properties file:
Then the user's belonging to SampleEnterprise will see "Book Title" on UI, whereas other enterprise users will see the module-specific internationalized labels ("The Title").
Please see the "Internationalization" section for more information.