Update demo page

[greybax]

Add ability for switching between ‘transform’ and ‘reverse’ methods in UI

[gregorycode]

I'll work on this.

[greybax]

@Grigory57 any updates on your side?

[gregorycode]

There is an error: Uncaught ReferenceError: require is not defined.

[greybax]

?

[gregorycode]

Try to open up your demo page and enter something into the Cyrillic textarea. There is an error in console. Or maybe I am doing something wrong.

[greybax]

Ok, got it. Seems we need to fix it first. Will you do that or I can take a look on it a bit later?

[gregorycode]

Unfortunately I cannot do that right now. So it's better you to fix that.

[greybax]

FYI @Grigory57 the "error: Uncaught ReferenceError" was fixed