Add first name shortcut in chat

Currently, there is only a shortcut to add the visitor's full name in chat. Please add a shortcut that only pulls the first name of the visitor in chat.

This will help us when we are creating introduction macros when a new visitor joins chat. The current workaround is to insert the full name and then delete the last name manually each time.

The first name feature does exist in the Support module, but not Chat.