Usability improvement

[radl97]

Hey, I really like this project, thanks for sharing it with people!

One small note: it is bit of a pain using the demo as it is now.

The usability can be improved by constantly showing the already decoded texts. It changes the "demo" into a fully operational tool, in my opinion. (For me, who do not want to share data with a server.)

Note that the implementation is now ugly, it only demonstrates the idea. However, I am open to suggestions to how to solve this in a more elegant way.