translation problems with events+ plugin

After having translated all teh plugin with localisation an erro message comes up :Warning: The actual loaded translation content contains mixed textdomains and is not pure translateable within one textdomain.
It seems, that there is code contained extracted out of other plugins, themes or widgets and used by copy & paste inside some source files.
The affected unknown textdomains are: agm_google_maps
Could you please advise what to do specially for not losing all the work done or maybe do you already have a french version. thks in advance for your urgent help Jacques