I've installed Real Estate Manager Release 5.1 Free. I got two languages installed (English-Spanish). Everything seams to work fine, besides the "Language associate houses" that doesn't work. Next to the drop-down list another field with "0" is shown, which I think shouldn't be there.
I can select the corresponding property in the other language, but after "Apply" or "Save & Close" it doesn't seam to be stored in the database. When opening the same house for edition again nothing is selected in the drop-down list.