Removed many comments

Frontend Angular 4/src/app/layout/grupos/grupos.component.ts

...end Angular 4/src/app/layout/matefun/matefun.component.ts

...group-users-modal/manage-group-users-modal.component.html

...e-group-users-modal/manage-group-users-modal.component.ts

...equest-feedback-modal/request-feedback-modal.component.ts

.../return-feedback-modal/return-feedback-modal.component.ts

...gular 4/src/app/shared/services/group-document.service.ts

Frontend Angular 4/src/app/shared/services/group.service.ts