It would be nice having the option to enable a language on specific screens instead of the whole application.
For example
Our application is English based. Recently we've developed a scheduler for the reservations of our company vehicles. We only use this scheduler and vehicle maintenance for our office in the Netherlands so it would be nice to translate these fields to Dutch.

Workaround
Of course I know it's possible to add a new application language, translate the fields to Dutch but it's not appropriate to translate the entire application which means several screens will remain untranslated.
Another option would be to misuse English translation objects by translating them into Dutch, but this isn't chic either.
