Fix text for areas report

courses/stats/serializers.py

@@ -87,7 +87,7 @@ class ActionSerializer(serializers.ModelSerializer):
         if isinstance(obj, Forum):
             return ' no fórum ' + obj.title
         if isinstance(obj, AccessibleArea):
-            return ' na área ' + self.get_accesible_area_name(obj.name)
+            return ' a área ' + self.get_accesible_area_name(obj.name)
         if isinstance(obj, LearningObject):
             unit = obj.unit.title
             step = obj.unit.lesson.name