Features/default EmailTemplate for HalfYearProcess and HalfYearProcessOverdue

https://trello.com/c/OHeaoNfJ/163-default-emailtemplate-for-halfyearprocess-and-halfyearprocessoverdue

https://trello.com/c/GNJw3JzA/187-semesterprocessaddvolunteers-admin-sees-editable-email-template-for-those-volunteers

currently, the evaluation of a template is not done, that will be in a different task