Thank you for reporting. The Arabic عِرق has always been associated with "race". The English "ethnic" can have a different meaning (Please check this Arabic Wikipedia article). An ethnic fighting can be between two parties of the same race/عِرق. However, since عرقيّ is widely used to translate "ethnic", the word will be added to the dictionary next to إثنيّ. It will be visible online after our next update, within a few months.