LPS-31452 send the message before importing/exporting so that I know what I am currently exporting/importing
LPS-31452 send the model name in the message
LPS-31452 provide the total count in the backend (not only the maps with classes)
LPS-31452 Use different constants for export and import (from Constants.*)
LPS-31452 missing css class
LPS-31452 display progress bar in the front end
LPS-31452 BackgroundTaskStatus can be null under some circumstances
LPS-31452 the backend seems to return negative or 0 values for the total in several moments of the process
LPS-3145 the counters may be null at some points of the process too