I'm going to ask a yter to give a shoutout to JNC. Hopefully he does since he likes to support anything related to anime. We need to get more people to know about JNC and it's awesomeness.
J-Novel Club is a relatively new company so don't expect that happening anytime soon. I don't know if Sam has any plans of making the translations in different languages but I doubt it. There is also the problem of translators and an actual market. The Light novel market is very tiny so I doubt any company would make any profit of making translations in other languages.
@Damien-Wilson The problem with allowing people to use the API officially is that then there is an expectation that I won't just change something and break everyone's apps.
There's a significant amount of infrastructure and documentation that would be required to allow such functionality without being really flakey.