Change copy English value icon?

[liammulh]

@oliver-phet, @DianaTavares, what do you think a better icon would be for the copy English value icon? I am using https://icons.getbootstrap.com/.

In the test for Rosetta 2.0 (phetsims/qa#869), @DianaTavares noted that it would be helpful to have a button to copy the English value to the clipboard so that it could be easily pasted into Google Translate.

I think this could be done with the Clipboard API easily enough. And we could add this feature in a future release.

However, the current button has an icon that looks a lot like a button for copying to the clipboard:

We should probably change this icon before Rosetta 2.0 is released to avoid confusion with a future copy to clipboard button.

[DianaTavares]

I like the two pages icon for copy in the clipboard. What about an arrow to represent passing the English string to the translation side?

[oliver-phet]

Sure, probably not a bad call to better distinguish this behavior from 'copy to clipboard'.
I actually like box-arrow-in-right because I think it better implies inserting something in the box (the English string).

I'd like to defer any copy to clipboard until after 2.0, though. I remember @kathy-phet had some reservations around allowing translators to copy the value of English strings.

[Nancy-Salpepi]

In round 2: copy button has been changed to box-arrow-in-right.

Closing.