AP: Add separate button on teams calendar page for "applications to join team"

[olirowan]

When users request to join a private team, the owner must go to the teams settings page. This may not be clear to the user therefore, creating a separate button for accepting request may be more intuitive & understandable. - (This would be similar to the invitations button on the teams dashboard page, with a mail logo & a count of the notifications/applications)