The Inventory Part Accounting Group basic data has Basic Data Translation support, meaning that the descriptions are stored internally per language. So if you create the record while logged on in English this will save the English description. If you then log on in Swedish and changes the description this change will only apply when logged in with Swedish whereas the English translation remains untouched. Please see more information on this functionality here (this is for IFS Cloud but this functionality is essentially unchanged):

https://docs.ifs.com/techdocs/24r1/030_administration/150_setup/158_translation/020_basic_data_translations/