Ok, I just changed to Russian to give you a little tutorial with pictures.
First, open Bandicam. Russian should look like this.
Click on the button where I've put the black square.
Second, click on the tab I've put a black square on (the third tab).
Third, there should be a dropdown box there, click it.
Fourth, choose English (or any other language for that matter, but I'm choosing English).
Fifth, it should come up with a box, click YES.
Sixth, Bandicam should now restart. And it will look something close to this:
Hope this helped you.
-Alex/LazehPanda