Backtick is used for deploying and hiding the preview window.
On my swedish keyboard, Backtick is a Dead Key.. 
It requires me to shift+' and then space to get `

On a US keyboard ` seems to be located on the key LEFT OF 1!
I have a § on that key. I never use it and on most layouts I've seen
it's not used for important keys.

I propose that you bind the key to the Keysum instead of the Backtick
it produces.

The KeyCode is 0x31 49 061

So if you lock the Key to the KeyCode it should work on any system, it's
just that on a US system it's the ~ character and on other systems it's
another.. but it'll still be the same Key.

This is probably a Duplicate but at least it has a solution that works
on a majority of systems, as it is now it only works for US systems.