* refactors konova/autocompletes.py by splitting into individual files and moving them to fitting apps
* autocomplete files now live in APPNAME/autocomplete/...
* adds button and functionality for leaving a team
* if the admin leaves the team, another user will be chosen as new admin automatically
* improves Team (django) admin backend
* better control over user adding-removing
* only added team members are selectable as admin
* adds user/includes/contact_modal_button.html for calling contact data of a user
* adds user contact modal to intervention detail view
* adds translations
