Clarify that focusing 'Domain ID' or 'Embed code' box copies to clipboard

[tkw1536]

When focusing the 'Domain ID' or 'Embed ID' fields in the Domain Edit Modal their content is copied to the clipboard.

This is a great feature, however it lacks any kind of indication in the UI or the documentation.
I only found out about it because I wanted to implement this feature myself and found that it already existed when looking at the source code.

It would be great if some text like Click to Copy could be added to the interface to indicate to users that this feature exists.

[electerious]

Definitely. Some kind of popup or notification would be great.

[electerious]

Copy.to.clipboard.mov

Implemented. It's currently in the events branch and will therefore be part of the next minor/major release.