* Tweak - Update team members template to display the member's last login relative date to team owners and managers
* Tweak - Add setting in the "Team membership ending soon" email admin screen to set the number of days before team membership expiration to trigger the corresponding email
* Fix - Do not show the registration link field on the add member template if there are no remaining seats left
* Fix - If the current team member is the owner, do not display a 'Leave Team' button in front end when managing the team
* Fix - When there is only a seat left in a team and viewing the Team Members front end page, ensure no PHP warning is issued and the remaining seats message is shown
