The Other Contacts folder is a read-only folder created by the server. Google creates contacts in that folder when there is some interaction with them. While you can’t edit the contents in eM Client, you can in the Google Contacts web page.
See my comments here:
Pre eM Client 10.1.x, you will get an error if you try to make any changes to that folder in eM Client. You can right-click on the folder and choose Properties > Repair> Repair to cancel any pending changes to the folder and resync it from the server.