improve UI in browser demo

[Marak]

lets add some intent to the form inputs and trigger the translation to work on keypress and select box changes.

"intent" means adding a delay in firing the event associated with keypress, etc, and grouping them so that we don't spam ajax requests. we can't map keypresses to ajax requests 1:1.

[Marak]

it looks like this might be solved by http://github.com/helpmepro1/translate.js/commit/35340ed19b52ceab6ec2385bf64c034e165f2d58

will check tonight and merge

[Marak]

started to implement this, will try to push later this week