If you load two full Archicad Libraries from different localisations you will be presented with a constant error for duplicate library parts. You should only load one Archicad Library at a time. I assume there are some objects in one or the other that you use and are not available in both localised libraries? You could embed the objects in to your file from the localised Library that has them and then just load the other full library in.
Lee Hankins ArchiCAD 4.5 - Archicad 27UKI Apple Silicon 5003 macOS Ventura (13.5.2)