Translating Google Maps

I'm using Worpdress 3.2.1 and Google Maps 2.3.1 - I'm using the plugin for an estate agency and my initial problem is just a change in the default text - I'd like to change Posts to Properties on a mash up map showing all maps.
I've edited agm_google_maps-default.po and added Properties as a translation for Posts and uploaded the PO and MO files but no change on the front end.
I will be doing more translations as the site will also be in French so what am I doing wrong?

As an aside can I remove directions from the maps? I've done it (sort of) via css but is there a way to just remove it.