Tests and comments on shared => DONE

...stance/documentation/containers/dataset-list.component.ts

...tance/documentation/containers/documentation.component.ts

client/src/app/shared/components/navbar.component.spec.ts

client/src/app/shared/components/navbar.component.ts

client/src/app/shared/components/spinner.component.spec.ts

client/src/app/shared/components/spinner.component.ts

...rc/app/shared/pipes/attribute-list-by-family.pipe.spec.ts

client/src/app/shared/pipes/attribute-list-by-family.pipe.ts

client/src/app/shared/pipes/dataset-by-name.pipe.spec.ts

client/src/app/shared/pipes/dataset-by-name.pipe.ts

.../src/app/shared/pipes/dataset-list-by-family.pipe.spec.ts

client/src/app/shared/pipes/dataset-list-by-family.pipe.ts

client/src/app/shared/pipes/index.ts

client/src/app/shared/pipes/instance-by-name.pipe.spec.ts

client/src/app/shared/pipes/instance-by-name.pipe.ts

...t/src/app/shared/pipes/option-list-by-select.pipe.spec.ts

client/src/app/shared/pipes/option-list-by-select.pipe.ts

client/src/app/shared/pipes/output-family-by-id.pipe.spec.ts

client/src/app/shared/pipes/output-family-by-id.pipe.ts

client/src/app/shared/pipes/survey-by-name.pipe.spec.ts