Pass locale to custom preview component

**Is your feature request related to a problem? Please describe.**

I created a custom widget where I select resources from a remote API. In that deployment, I have i18n set up. The field is `i18n: duplicate`

When I open the preview, I would like to fetch the resources from the API to render the right label in the currently edited language. The problem is that in the preview component I do not know which language to display.

**Describe the solution you'd like**

The control get a prop `locale`. It would be good to have the same prop also set to the preview component.

**Describe alternatives you've considered**

**Additional context**

I also noticed that the preview component is not refreshing when edited language is changed. That would also be handy