Merged in task/dspace-cris-2023_02_x/DSC-1669-2 (pull request DSpace#1992)

[DSC-1669] - fix issue with translation for nested fields

Approved-by: Giuseppe Digilio

Author: NikitaKr1vonosov

src/app/cris-layout/cris-layout-matrix/cris-layout-box-container/boxes/metadata/rendering-types/metadataGroup/metadata-group.component.ts

@@ -88,7 +88,7 @@ export abstract class MetadataGroupComponent extends RenderingTypeStructuredMode
    * Returns the translated label, if exists, otherwiuse returns a fallback value
    */
   getLabel(field: LayoutField): string {
-    return this.getTranslationIfExists(`${this.fieldI18nPrefix}.${this.item.entityType}.${this.nestedMetadataPrefix}[${field.metadata}]}`) ??
+    return this.getTranslationIfExists(`${this.fieldI18nPrefix}.${this.item.entityType}.${this.nestedMetadataPrefix}[${field.metadata}]`) ??
       this.getTranslationIfExists(`${this.fieldI18nPrefix}.${this.item.entityType}.[${field.metadata}]`) ??
       this.getTranslationIfExists(`${this.fieldI18nPrefix}.${this.item.entityType}.${field.metadata}`) ?? // old syntax - do not use
       this.getTranslationIfExists(`${this.fieldI18nPrefix}.[${field.metadata}]`) ??