The Additional collection label in the UI will be translated like any other UI label via the resource bundle. The system searches for the collection label in the resource bundle and displays the resource bundle value. If no translated values exist, the system displays the collection label value from the source data.

For example, if the Additional collection label value in source file is "XYZ". Then add the key as "XYZ" in the respective translation JS files (delivery/app/translation/*js) and provide the translation value for the specified language. The system will then display the localized string for Additional collection in the BOM UI.