Flexible Survival Conversion

We have a rather sizable project running on Inform 7 that we need updated to the modern era. What we're looking for is a HTML5 game engine for a mostly text based game. The original game can be found here: [login to view URL] If you set up the framework so that we can enter the data, we can handle that part. The engine should be friendly for adding places, creatures, infections, items, NPCs and events. If you feel confident you can make the code back end somewhat similar to Inform 7, that would be a bonus, but not strictly required. We can provide graphics if you give us a place to put them, code wise, and already have graphics for many creatures and characters. Warning: This is an adult game.