Send license and permit pdfs - Frontend

[dbampalikis]

As a bird ringing center administrator
I want to send the license and permit to a ringer/helper
In order for them to be allowed to perform the permitted actions (bird ring?)

This issue involves the frontend part - Add buttons to each view a user can send emails from

• License list view
• License entry view
• Actor list view

This is a first version where we assume that there is no selection on the batch actions and all licenses/actors get an email when selecting a batch action

[HenrikeW]

Related to #67