Add input for research, number of data in the dataset

...s/dataset-detail/dataset-data/dataset-data.component.html

...nts/dataset-detail/dataset-data/dataset-data.component.ts

...e/components/dataset-detail/dataset-detail.component.html

...e/components/dataset-detail/dataset-detail.component.scss

...rce/components/dataset-detail/dataset-detail.component.ts

src/app/geosource/services/dataset-detail.service.ts

src/i18n/messages.en.xlf

src/i18n/messages.fr.xlf