fixed naming (#751)

config/locales/en.yml

@@ -319,7 +319,7 @@ en:
     location:
       name: "Location name (optional)"
       units: "Total number of units at this location"
-      type_of_unit: "What is this type of scheme?"
+      type_of_unit: "What is the most common type of unit at this location?"
       wheelchair_adaptation: "Are the majority of units in this location built or adapted to wheelchair-user standards?"
       startdate: "When did the first property in this location become available under this scheme?"
       add_another_location: "Do you want to add another location?"