Update i18n in login with routes and add 404 page

Frontend Angular 4/src/app/app-routing.module.ts

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

Frontend Angular 4/src/app/login/login.component.html

Frontend Angular 4/src/app/login/login.component.ts

...d Angular 4/src/app/not-found/not-found-routing.module.ts

...tend Angular 4/src/app/not-found/not-found.component.html

Frontend Angular 4/src/app/not-found/not-found.component.ts

Frontend Angular 4/src/app/not-found/not-found.module.ts

...ar 4/src/app/shared/components/header/header.component.ts

Frontend Angular 4/src/app/shared/guards/auth.guard.ts

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

...tend Angular 4/src/app/shared/services/haskell.service.ts

...tend Angular 4/src/app/shared/services/usuario.service.ts

Frontend Angular 4/src/assets/i18n/en.json

Frontend Angular 4/src/assets/i18n/es.json