so it is cleaner to set the right name for this operation, and use proper
internationalization process to get the right translations

The variable is used in Detiq-T to copy translations files (*.qm)
to the 'lang' subfolder

... and update Detiq-T submodule

and improve messages, remove useless comments

And methods have been reordered in cpp file

Rename some variables
Remove unnecessary variables
Add missing letters in comments / strings
Add comments

The error is now stored in an Image with double values,
without restriction on these

Also update the lib to the last revision