Please note that you have to refresh the Permalinks settings after making changes to the slugs or anything related to the slugs. To refresh the permalink structure, simply navigate to Dashboard → Settings → Permalinks and save it once.
Custom Post Type Slug Translation
To translate the slugs of Property, Partners and other Custom Post Types navigate to Dashboard → WPML → Settings section and scroll down to find Post Types Translation section.
Taxonomy Slug Translation
You can also translate slugs of any Taxonomy as well as Category in this very section.