FEAT #10733 TIME 1:45 wip get, getbyid, create, delete groups

lang/en.json

lang/fr.json

rest/index.php

src/app/group/controllers/GroupController.php

src/app/group/controllers/PrivilegeController.php

src/app/group/models/GroupModel.php

src/app/group/models/GroupPrivilegeModel.php

src/app/user/models/UserGroupModel.php