Enable content of invitation messages to be reviewed in 'Roles & Invites'

Currently, in 'Roles & Invites' you can see the list of invites that have been sent etc., but the action button for each only has the option to 'Resend invite'.

Since we often customise the invite message, it could be useful if the content of the message could be reviewed before we follow up or resend unaccepted invites.

To enable this function, please add the option 'Review invite' to the action button for each invite.