Clean repo + correct bug on delete

src/ApiBundle/Controller/DefaultController.php

src/BackendBundle/Controller/EntityBrowserController.php

src/BackendBundle/Controller/NotificationController.php

src/BackendBundle/Entity/League.php

src/BackendBundle/Form/LeagueType.php

src/BackendBundle/Repository/DeviceRepository.php

src/BackendBundle/Repository/LeagueOnDeviceRepository.php

src/BackendBundle/Repository/LeagueRepository.php

src/BackendBundle/Repository/NotificationRepository.php

src/BackendBundle/Repository/PredictionRepository.php

src/BackendBundle/Resources/views/league/form.html.twig

src/BackendBundle/Resources/views/league/list.html.twig

...BackendBundle/Resources/views/notification/list.html.twig

src/BackendBundle/Resources/views/prediction/list.html.twig

src/BackendBundle/Resources/views/team/list.html.twig

web/js/ajax-select-and-delete.js