How can I get rid of iWnn IME keyboard?

I've updated my rooted, Nexus 5 with an OTA update to Android 5.0 Lollipop and since then I have noticed something that quite bugs me.

After the update has been added to the phone a new keyboard without any of my permission.

I don't need this keyboard and it just mess up all of my apps.

I've tried to delete it with ROM Toolbox, but as you can see it still remain in my settings menu.

And whenever I change my language key when I'm writing it's changes to this keyboard as well,

and the app crashes.

My phone is in Hebrew, But you can see there is a keyboard that called iWnn IME.

and ii says below in grey "Japanese" in hebrew.