Improve the naming of the organ in the Explore page

Some differences in metadata completion between the first datasets ingested and the new ones brought some divergent behaviours in the Explore page. The metadata used to name the organ (SamplePatient_organ_name) was previously stored in only one metadata ("heart", "left lung", "right kidney:...) but this nomenclature has changed with SamplePatient_organ_name now having only the name of the organ ("heart", "lung", "kidney"...), the position being stored in SamplePatient_organ_description. These changes have been implemented in ICAT for the first ingested datasets. The correct organ name is now built using the two metadata to have both the organ and the position displayed.